Laptop stress test online. Does it hold its speed?
Find out whether your laptop slows down when it works for more than a few seconds. The free run loads the processor and graphics for 3 minutes, in this browser.
Plateau, then a single step down.
Throughput held for 18 seconds, then fell in one transition and stayed there. One fall accounts for 98% of everything the run gave up.
Illustrative shape. Your run draws its own, and the report reads that one.
Processor
Every core, 60 s
Graphics
Scene and path tracer
Run
3 min, or 9 min Deep
Flags
Battery, hidden tab
Laptops slow down in ways a quick test misses.
Thin laptops often run fast for a few seconds, then fall back to a lower power limit or throttle as they heat up. The run is long enough to catch both.
- Past the power budget
- The CPU stage runs 60 seconds, past the short burst of extra power many laptops allow, so a drop when that budget ends is caught.
- Graphics under load
- A fixed 3D scene and a path tracer load the graphics chip, which on a laptop shares the same cooling as the processor.
- Battery noted
- Laptops limit their speed on battery. The report notes when a run was on battery, so you can compare it with a plugged-in run.
- Deep run for heat
- The Deep run takes 9 minutes, holds the processor long enough to heat the chassis, and re-tests it hot.
Reading a laptop stress test result.
The shape of the slowdown matters more than the score. These are the parts of the report to read first on a laptop.
Slowdown
How much speed the processor lost over the stage. Some loss is normal on laptops; a large loss is worth checking.
One step down
A single drop after a few seconds is consistent with a power limit, which is a setting or a design choice rather than a fault.
A steady slide
Speed that keeps falling usually means the cooling cannot keep up: dust, dried thermal paste, or a blocked vent.
Both parts falling
When the processor and graphics both lose speed, the shared cooling or chassis is the limit rather than one part.
Plateau, then a single step down.
Throughput held for 18 seconds, then fell in one transition and stayed there. One fall accounts for 98% of everything the run gave up.
Illustrative shape. Your run draws its own, and the report reads that one.
Hardware
What it needs. Three tiers, no fine print.
Minimum
Any laptop, any browser
Windows laptops, MacBooks and Chromebooks all complete the run.
Recommended
Plugged in, on a hard surface
A bed or sofa blocks the vents and changes the result.
Optimal
Two runs
One plugged in and one on battery shows how much the power setting costs.
In short
Laptop stress test: the answer first
To stress test a laptop without installing anything, run the free test plugged in: it holds the processor for a full minute, past the short power budget many laptops allow, then loads the graphics chip that shares the same cooling. The report shows whether either gave up speed and notes when the run was on battery.
Reading your result
- One step down
- A single drop a few seconds in is consistent with a power limit, which is a setting or a design choice rather than a fault.
- A slide that keeps going
- Speed that keeps falling is consistent with cooling that cannot keep up, such as dust or a blocked vent, alongside look-alikes the report lists. A sensor tool confirms it.
- Plugged in against battery
- Laptops cap their speed on battery by design. Run once on each and the difference between the two curves is what the power plan costs you.
What good looks like
The ranges, before you run it.
Slowdown under long work
- Under 8%
- Holds its speed
- Little lost over the run.
- 8% to 15%
- Normal
- Common on laptops and compact PCs.
- 15% to 30%
- Noticeable
- Long tasks run clearly slower than short ones.
- 30% or more
- Worth checking
- Often heat, dust or a low power limit.
Graphics smoothness
- 90% or more
- Smooth
- Frames arrive at an even pace.
- 75% to 89%
- Mostly smooth
- Occasional uneven frames.
- Below 75%
- Uneven
- Visible stutter is likely in motion.
Overall score (provisional bands)
- 85 to 100
- Excellent (provisional)
- Fast, and it keeps its speed under long work.
- 70 to 84
- Strong (provisional)
- Comfortable for demanding work.
- 55 to 69
- Good (provisional)
- Fine for everyday and moderate work.
- 40 to 54
- Modest (provisional)
- Everyday tasks; heavy work will feel slow.
- Below 40
- Limited (provisional)
- Struggles with sustained work.
What a browser cannot see
The honest limits, and where to look instead.
- How full your memory isA web page cannot see how much memory is in use. If the machine slows down with many apps or tabs open, check it directly.
- On a MacActivity Monitor, Memory tab: Memory Pressure at the bottom. Yellow or red means memory is the limit.On WindowsTask Manager (Ctrl+Shift+Esc), Performance, Memory. Above about 85% in use while you work means memory is the limit.
- Temperatures and fan speedNo browser can read a temperature sensor, so heat shows here only as speed lost over time.
- On a MacA free app such as Stats shows temperatures and fan speed.On WindowsHWiNFO, or your laptop maker's own app.
- Storage speed and healthOpening apps and files depends on the drive, which this test does not touch.
- On a MacDisk Utility, then First Aid on your main drive.On WindowsCrystalDiskInfo shows the drive's health status.
Questions
Laptop stress test, answered
- How do I stress test my laptop online?
- Start the free test on this page and keep the tab in front. It loads the processor and graphics for 3 minutes and reports whether the laptop held its speed.
- Is it safe to stress test a laptop?
- Yes. A laptop slows itself down to protect against heat long before damage is possible. Run it on a hard surface, and close the tab to stop at once.
- Can it tell me if my laptop is overheating?
- It cannot read temperature, because no browser can. It measures lost speed under load, and a steady slide is the usual sign that cooling cannot keep up.
- Why is my laptop slower on battery?
- Laptops lower their power limits on battery to last longer. Run the test once plugged in and once on battery to see the difference on your machine.
- Does it work on a MacBook?
- Yes. The test runs in Safari and Chrome on a Mac, including Apple silicon MacBooks.
- Is it safe to stress test a laptop in a browser?
- The load is ordinary work the browser already allows, and the laptop's own protections stay in charge. Keep the vents clear, run it plugged in, and close the tab to stop at any moment.