Problems
Whatever it's doing, start from the symptom.
Slow, hot, loud, short-lived: each problem here gets its causes ranked by likelihood, a check that confirms each one, fixes in cost order, and an honest line about where software cannot see.
Laptop and PC problems, causes ranked
These 159 articles each take one complaint about a laptop or PC, such as slow, hot, loud, short battery life or stutter, and answer it the same way: a short answer first, then the question that halves the list of causes (does it happen from the first minute, or only after a few minutes of work?), then each likely cause with a check that confirms it on your machine and a fix in order of cost, then what software cannot see. Most of the fixes are free settings or cleaning; a part is suggested only when the checks point to it.
Where a measurement helps, each article says what the free 3-minute browser stress test would show for that problem. A browser cannot read temperatures, fan speeds or power draw, so the test records throughput over time and names the shape of the curve, and the articles name the sensor tool that confirms a cause. The methodology page sets out each stage of the test, the guides explain the main ideas at length, and the glossary defines the terms.
Good places to start
Slowness
- Why is my laptop so slow?A slow laptop almost always has one of six causes: a full or ageing drive, too little memory for what is open, background software eating the processor, thermal throttling, malware, or hardware that was never fast to begin with..
- Why is my laptop slow after a Windows update?For the first hours after a Windows update, slowness is usually the update itself: indexing, optimisation and cleanup keep running after the restart, and they are heavy on disk and processor..
- Why has my laptop gotten slower over time?Laptops do get slower with age, but the silicon is not what ages.
- Why is my laptop fast at first, then slow?A machine that starts fast and slows after minutes is hitting a limit: almost always heat, sometimes a power budget.
- Why does my laptop keep hanging?A laptop hangs when something it depends on stops answering, usually memory that has run out, a drive that is struggling, a processor pinned at 100%, or heat pushing the system to its edge.
- Why is my MacBook slow after a macOS update?The first day after a macOS update is housekeeping: Spotlight rebuilds its index, Photos re-analyses the library, iCloud reconciles, and on a fanless Air all of that also makes heat.
- Why is my laptop slower on battery?Most laptops deliberately run a lower power limit on battery: the same machine that boosts hard at the desk holds back unplugged to protect runtime and the battery itself.
- Why does my laptop take so long to start up?Boot time is its own problem with its own causes, which is why fixes for general slowness rarely help it.
- Why is my laptop slow after waking from sleep?If a restart fixes it and a fresh boot never shows it, this is a resume problem rather than a performance problem.
- Why is my brand new laptop so slow?A new machine spends its first hours and sometimes days doing work you did not ask for: installing updates, indexing the drive for search, syncing cloud accounts and downloading the applications you restored.
- Why does my laptop slow down with many browser tabs open?Because each tab holds memory, and when the machine runs out it starts moving memory to disk.
- Why does my laptop take so long to shut down?Because the operating system is waiting for something.
- Why does my laptop lag when I type?Typing lag is almost never raw processing speed, because typing costs almost nothing to process.
- Why is my laptop still slow after a factory reset?Give it a day first.
- Why is my work laptop so slow?Because it is doing more than a personal machine of the same specification.
- Why is my PC suddenly slow?When a computer that was fine becomes slow overnight, something changed, and the most common change is work you cannot see: an update installing, a drive being indexed, a cloud folder syncing, or an antivirus scan.
- Why is my PC so slow right after it starts?There are two separate problems hiding in this question.
- Why is my PC so slow and laggy?Slow and laggy point at different things.
- Why is my PC slow after a Windows update?For the first day after a large Windows update, slowness is normal: the system rebuilds its search index, re-optimises apps, and finishes installing in the background.
- Why does my PC take so long to open programs?A program that is slow to open but fine once running is waiting on storage.
- Why is my PC slow with 100 percent disk usage?Disk usage at 100 percent means the drive is the part everything else is waiting for.
Battery
- Why is my laptop battery draining so fast?Fast battery drain has two families of cause: the machine is spending too much power, screen brightness, background processes, a performance power plan, heat, or the battery has less to give than it once did, because cells age with every cycle..
- When should I replace my laptop battery?Replace the battery when its full-charge capacity falls below about 60–80% of design and the shorter day bothers you; immediately if it swells; and soon if the machine shuts down with charge still showing..
- Why is my laptop battery draining while plugged in?A plugged-in laptop that still drains is doing arithmetic out loud: the machine is drawing more watts than the charger supplies, and the battery covers the difference.
- Why is my laptop charging so slowly?Slow charging is usually a supply problem rather than a battery problem: an undersized adapter, a cable that cannot carry the wattage, or the wrong USB-C port.
- Why does my laptop shut down at 30% battery?An aged battery can report a charge it cannot actually deliver.
- Why is my laptop plugged in but not charging?Start with the cheapest possibilities, because they are also the most common: a charger or cable that has failed, a port that is loose or dirty, or a deliberate battery-conservation setting that stops charging at a limit on purpose.
- Is it bad to leave my laptop plugged in all the time?You cannot overcharge a modern laptop: it stops drawing charge at full and runs from the mains.
- Why does my laptop battery stop charging at 80%?Almost always because something is stopping it deliberately.
- What do I do about a swollen laptop battery?Stop using and charging the machine, and have the battery removed by someone qualified.
- Why does my laptop battery drain when it is turned off?Because it probably is not off.
- How do I make my laptop battery last longer?In order of what they return: lower the screen brightness, find and stop whatever is running in the background, use an efficiency or balanced power mode, reduce the refresh rate if the panel is fixed at a high one, and disconnect devices drawing power from the ports..
- Does fast charging damage a laptop battery?It contributes to ageing, modestly, because charging quickly produces heat and heat is what wears lithium cells.
- Why is my laptop screen stuck at 60 Hz on battery?Because the laptop lowers its refresh rate on battery to save power, by design.
Heat
- Why is my laptop overheating?A laptop overheats when it makes heat faster than its cooling can remove it.
- Why does my laptop get so hot while gaming?Games are the heaviest thing most laptops ever do: processor and graphics card at full power together, for hours, in a chassis thinner than a hardback.
- Is it bad for my laptop to run hot?Mostly the fear is misplaced and the cost is misplaced with it: heat almost never kills the processor, because chips throttle and shut down long before damage.
- Why does my laptop get hot while charging?Charging is itself a heat source: filling cells and the charging circuitry both give off warmth, and that stacks on whatever work the processor is doing.
- Why does my laptop overheat in summer?Because a laptop cooler does not remove heat, it moves heat into the room.
- Why does my laptop overheat on the bed?Most laptops take cool air in through vents on the underside.
- Should I repaste my laptop?Repaste when the machine is several years old, runs hot, throttles under load, and a thorough cleaning has already failed to help.
- Do laptop cooling pads actually work?They work, modestly, and how much depends entirely on your machine.
- What is a safe CPU temperature for a laptop?Under sustained load, most laptop processors run somewhere between 75 and 95 degrees Celsius, and that is normal.
- Why is my laptop hot when I am not doing anything?Because it is doing something.
- What should I do if I left my laptop in a hot car?Bring it inside and let it return to room temperature before switching it on, which usually takes an hour or two.
- Is thermal throttling normal?Yes.
- Is undervolting my graphics card safe?Yes.
Fan and noise
- Why is my laptop fan so loud?A loud fan is the machine reporting heat, and it is almost never wrong about it.
- Why is my laptop fan so loud after a Windows update?This complaint recurs with almost every update wave, and the script is stable: for the first hours, the update's own background work (indexing, optimisation, cleanup) loads the processor and the fan reports it honestly.
- Why is my laptop fan not spinning?Two very different situations share one symptom.
- What is the high-pitched noise from my laptop?A thin electrical whine or squeal that rises and falls with what the machine is doing, rather than with fan speed, is coil whine.
- How often should I clean my laptop fan?Once a year suits most machines in ordinary homes.
- Why is my laptop fan loud when the laptop is not hot?A fan answers a request, so a loud fan on a cool machine means either that something is asking for cooling you cannot see, or that the request is wrong.
- What do different laptop fan noises mean?The character of the sound is the diagnosis.
Under load
- Why does my FPS drop after 10 minutes of gaming?FPS that starts high and falls after five to fifteen minutes is thermal in the overwhelming majority of cases.
- What is thermal throttling, and is my laptop doing it?Thermal throttling is the processor deliberately slowing down when it reaches its temperature limit, trading speed for survival.
- Why is my laptop so slow when editing video?Editing slowness is four different problems wearing one costume: a codec your hardware cannot decode (scrubbing stutters), too little RAM (everything sticks as projects grow), thermal settling (exports crawl after minutes), and slow storage (loads and conforms drag).
- Why do video calls lag on my laptop?Call lag hides a two-suspect problem: the network (erratic, anytime, both directions garbled) and the machine (punctual, minutes into every long call, your outgoing feed degrading first).
- Why is my laptop's benchmark score lower than reviews?Reviews measure a cool machine, on mains, in performance mode, with nothing else running, often in an air-conditioned room, sometimes on a press unit configured better than the retail one.
- Does undervolting a laptop improve performance?It can, substantially, on a thermally limited machine.
- What are the best power settings for laptop performance?Set the operating system to its performance mode and the maker's own application to its performance or turbo profile.
- How can I make my laptop faster for gaming?Work in order of payoff.
- Why is my laptop throttling when it is not hot?Because heat is only one of several limits a laptop enforces.
- Does a second monitor slow down my laptop?It can, and for reasons that are easy to miss.
- Why does my laptop take so long to compile?A full build is one of the most sustained loads a laptop ever sees: every core busy for minutes, which is exactly the condition laptops are worst at.
- Why is my laptop slow when running virtual machines?Memory is almost always the binding constraint.
- Why is my laptop slow in Lightroom or Photoshop?Photo work is several different workloads wearing one name, and they bind in different places.
- Why does my laptop drop frames while streaming?Because a laptop that was already near its limit playing the game is now also encoding video.
- Why is my laptop slow at 3D rendering?Rendering is the purest sustained load there is: everything busy, continuously, until the frame finishes.
- Why is my laptop slower when connected to a dock?Because a dock is not a passive box.
- Why is my local AI model so slow on my laptop?Because generating tokens is mostly a memory bandwidth problem rather than a compute problem.
- Why is my laptop slow when the battery is removed?Because the battery is part of the power supply, not just a reserve.
- Should I turn off turbo boost on my laptop?It is a legitimate trade rather than a tweak.
- Why is Excel so slow on my laptop?Because much of what a spreadsheet does is single-threaded, and depends on how fast one core is rather than how many there are.
- How do I know if my GPU is the bottleneck?Lower the resolution or the graphics settings and watch the frame rate.
- How much do soft shadows cost in frame rate?Often more than any other single setting.
- Why is my PC slow while gaming?On a desktop, poor gaming performance is usually one of five things: the graphics driver, settings or resolution that outrun the card, the processor holding the card back in a demanding game, heat from a case that cannot move enough air, or a power supply at its limit.
- Can my PC run path tracing?Path tracing modes in current games are practical on graphics cards with dedicated ray tracing hardware from the last few generations, with the game's upscaling and usually frame generation turned on.
- Why does my game stutter even at high fps?Because the average frame rate is not what you see; the gap between frames is.
Refurbished and second-hand
- Is a refurbished laptop worth it?Usually yes, with conditions.
- What should I check on a refurbished laptop?Check in order of what is expensive to discover late: battery health first (the OS report, five minutes), drive health second (SMART, five minutes), sustained performance third (a load test, four minutes), then the physical tour, screen, keyboard, ports, hinges, speakers, camera..
- What battery health should a refurbished laptop have?Eighty percent of design capacity and above is fair on a refurbished machine and will serve for years.
- What do refurbished laptop grades A, B and C mean?Grades describe appearance.
- How do I avoid getting scammed buying a used laptop?Most used-laptop losses come from a short list: a machine still locked to someone else's account, internals quietly downgraded, specifications that do not match the listing, faults that only appear under load, and payment made before any of it was checked..
- Where is the safest place to buy a refurbished laptop?Judge the seller rather than the listing.
- What does a refurbished laptop warranty actually cover?Read four clauses before the headline duration: whether the battery is covered, whether labour and return shipping are included, what evidence is required for a performance complaint, and whether the remedy is repair, replacement or refund..
- Should I buy a refurbished MacBook?From Apple's own refurbished programme, it is one of the better value purchases available: the machine gets a new battery and outer shell, a full warranty, and the same return rights as a new one.
- How can I tell if a used laptop has been repaired?Look at the screws, the seams and the reported hours.
Before you buy
- What should I check when buying a used laptop?A private sale has no warranty, no grades and usually no return, so every check happens in the meeting or not at all.
- What laptop specs do I need for video editing?Editing has one spec question the sales page never answers: what does the machine hold during a forty-minute export, not a forty-second demo.
- What laptop specs do I need for graphic design?Design is the one workload where the screen outranks the processor: you deliver what you see, so the panel's colour truth is the product's quality control.
- What laptop specs do I need to run AI models locally?Local AI inverts the usual spec logic: memory decides what is possible and speed only decides how pleasant.
- What laptop specs do I need for gaming?The dirty secret of gaming laptops: the GPU badge is not the spec.
- What should I check before buying a gaming laptop?Gaming laptops fail buyers in one specific way: the badge on the box says one thing and the wattage inside says another.
- What should I check before buying a laptop for programming?A programming laptop is chosen with the hands and eyes first: you will spend thousands of hours on this keyboard and screen, and no core count compensates for hating either.
- What should I check before buying a student laptop?Start with the course, not the shop: departments publish requirements, and an architecture or engineering course changes the answer completely from a humanities one.
- What should I check before buying business laptops?Business purchases are judged over three years, not thirty days, so the checklist weights what consumer reviews ignore: serviceability and parts availability, docking that survives daily redocking, manageability and security hardware, and warranty terms with named response times..
- What laptop specs do I need for music production?Audio inverts the usual priorities twice.
- What laptop specs are best for programming?Programming splits into two spec profiles.
- What laptop specs do I need for streaming?Streaming is the double-load workload: the game at full tilt and a broadcast pipeline beside it, for hours.
- What laptop specs do I need for CAD work?CAD confounds spec shoppers because modelling and rendering want opposite things: parametric modelling runs largely on one fast core, while rendering and simulation devour every core you own.
- What should I check before buying a laptop for video editing?Editing is the workload that punishes short bursts of speed, because exports run for minutes and timelines scrub for hours.
- What should I check before buying a laptop for graphic design?Design is the one creative discipline where the screen outranks the processor.
- What should I check before buying a laptop for running AI models?Memory is the wall.
- Should I buy a MacBook Air or a MacBook Pro?Ask how long your heaviest task runs.
- How much slower is a laptop than a desktop?For short tasks, often barely slower.
- Is it worth buying last year's laptop model?Usually yes.
- What does laptop GPU wattage mean?The wattage is how much power the laptop maker allows the graphics chip to draw, and each maker chooses it per model.
- Should I buy an external GPU for my laptop?Sometimes, and less often than the idea deserves.
- How do I read laptop processor names?Read the letters, not just the digits.
- Is 8GB of RAM enough for a laptop in 2026?For one application at a time and light browsing, 8GB still works.
- Is a high refresh rate screen worth it on a laptop?For most people, yes, and not mainly for gaming.
- Should I buy an extended warranty for my laptop?For most people, no.
Specific machines
- Why is my MacBook Air M2 slow?An M2 Air that feels slow under real work is usually meeting its one design limit: it has no fan.
- Why does my gaming laptop drop frames?Gaming laptops have failure modes their desktop counterparts do not: a heatsink shared between processor and graphics card, a much lower power limit on battery, chargers that cannot feed a full gaming load, and a graphics path that may be routing through the integrated chip without telling you..
- Why does my MacBook Air get so hot?The MacBook Air has no fan.
- Why are my MacBook Pro fans so loud?On an Apple Silicon MacBook Pro the fans stay off or barely turning for the majority of everyday work, so audible fans genuinely mean something is drawing sustained power.
- Why is my MacBook Air M1 slow?The M1 Air is the mildest thermal case in the fanless line.
- Why does my MacBook Air M3 slow down under load?Because the M3 Air is fanless, and its body is the cooling system.
- Why does my MacBook Air M4 slow down during long tasks?Because it is fanless, and fanless machines trade sustained speed for silence.
- How do Windows on ARM laptops perform compared to Intel and AMD?Two differences matter more than raw benchmark scores.
- Why does my handheld gaming PC throttle?Because a handheld makes the power limit a setting rather than a secret.
Repair or replace
- Is my laptop dying?Probably not, most 'dying' laptops have one fixable ailment wearing a terminal costume.
- When should I replace my laptop, and when should I repair it?Replace when one of three things is true: the machine's measured sustained performance no longer fits your actual work; its OS is leaving support; or the pending repair bill crosses about half the price of an equivalent replacement..
- Should I upgrade RAM, upgrade the SSD, or buy a new laptop?Two readings decide it in five minutes.
- How long should a laptop last?Mechanically, a decent laptop runs seven to ten years.
- Will Windows 11 slow down my old laptop?Modestly, and mostly in specific places rather than across the board.
- How long does a gaming laptop last?Four to six years of useful life is a realistic expectation, with the first noticeable decline usually arriving around year three.
- How do I maintain my laptop to keep it fast?Five things, in order of how much they return: keep the vents clear and the machine on hard surfaces, clean the cooling system once a year, keep at least fifteen percent of the drive free, use a charge limit if the machine lives on a desk, and measure once a year so you can tell decline from imagination..
- How do I prove my laptop is in good condition when selling it?Buyers pay less when they cannot verify anything, so every claim you can evidence is money.
- How do I back up my laptop before it dies?Copy the irreplaceable things first: documents, photos, projects, anything not already synced somewhere.
How to check
- How do I check my laptop's battery health?On Windows: open Command Prompt and run powercfg /batteryreport, then open the HTML file it writes.
- How do I check if my Windows laptop is thermal throttling?Two methods, pick by circumstance.
- How do I stress test my laptop?A useful laptop stress test holds sustained load for minutes and measures what the machine keeps, not what it touches for a second.
- How do I check if my Mac is thermal throttling?Three routes, in rising order of convenience.
- Why is my CPU at 100% in Task Manager?Open Task Manager with Ctrl+Shift+Esc, click the CPU column to sort by it, and read the top row: that is your answer.
- Why does my laptop keep shutting down randomly?A laptop that switches off without warning is usually protecting itself, and the moment of the shutdown tells you from what.
- Is 100% CPU usage bad for my laptop?During work you started, no.
- How do I prove my laptop is throttling to the manufacturer?Support desks dismiss feelings and engage with repeatable measurements.
- How do I stress test my laptop's GPU?Run a sustained graphics load for at least ten to fifteen minutes and watch what happens to the frame rate rather than to the peak score.
- How do I check my laptop's specifications?On Windows, press the Windows key and type About to open the system page, which lists the processor, memory and edition.
- Why does restarting my laptop make it faster?Because it discards accumulated state.
- How do I know if my laptop is slow or my internet is slow?Do something entirely offline.
- How do I know if my laptop is CPU or GPU limited?Watch utilisation during the workload that matters.
- Why is my laptop making a clicking noise?If the machine has a mechanical hard drive and the click is a regular tick or a repeated knock, back up immediately and diagnose afterwards.
- What should I test on a new laptop?Spend thirty minutes in the first week rather than thirty seconds on the first day.
- Is it safe to stress test my CPU?Yes, on any processor made in roughly the last fifteen years.
- How long should I stress test my CPU?Three minutes answers the question most people are actually asking, which is whether the machine holds its speed or gives it back.
- What is the difference between memory bandwidth and memory speed?Memory speed is a rate: how many transfers per second the memory runs at, written as a number like DDR5-6000.
- How do I test my RAM speed?There are two different things people mean, and they need different tools.
- Can a bottleneck calculator tell me if my CPU is holding back my GPU?Not reliably.
- Should I stress test my GPU?Yes, in four situations: a new or second-hand graphics card, a laptop still inside its return window, after changing a driver, overclock or undervolt, and when games get slower the longer you play.
- How long should I stress test my GPU?Around five minutes shows whether a graphics card is throttling, because a card has more metal to heat than a processor and takes longer to reach its limit.
- Is it safe to stress test my graphics card?Yes, for a healthy card.
- Can I stress test my GPU online without downloading anything?Yes.
- Is my monitor really running at 144 Hz?Often not.
- Why is text blurry on my TV when I use it as a monitor?Because the TV is receiving colour at a lower resolution than brightness.
- My monitor ghosts. Which overdrive setting should I use?Ghosting is a faint trail behind moving objects, from pixels that take longer to change than one frame lasts.
- How do I check if HDR is actually on?Ask the browser.
Questions
With the time signature. If it is slow from the moment you start working, look at background load, storage and power settings. If it is fast at first and slower after a few minutes, look at heat and power limits. Each article in the Slowness group opens with that fork.
Most do not: they are settings, cleaning and checks in the operating system's own tools. Where a cause can only be confirmed with a sensor reading, the article names a monitoring tool for that one check.
It tells you how the machine behaves under a sustained load and which causes that behaviour is consistent with. It cannot read a temperature or a fan speed, so it narrows the list rather than naming a single cause, and the article for your symptom says how to confirm which one it is.
When the free checks have been done and the measured behaviour has not improved: for example, a machine that still loses much of its speed under load after cleaning and a power mode change. The Repair or replace group covers that decision.