PC performance test. Online, free, measured on your machine.
To test your PC's performance, run the free test in your browser: it loads the processor, memory and graphics, then reports how much speed the machine keeps under load.
3 minutes in your browser. No download. How we measure
A system performance check that runs in the browser: the processor, memory and graphics are loaded for three minutes, and the report says what the machine held and where it gave way.
Illustrative run. Your own cores draw their own.
Processor
Every core, 60 s
Memory
Bandwidth and latency
Graphics
Scene and path tracer
Whole run
3 minutes
Sustained, not peak. The number that decides how a PC feels.
A performance testing tool for a PC usually reports the first second, which every machine wins. This one holds the load and reports what is left after the power and heat limits arrive.
- Held under load
- Every logical core is worked for 60 seconds, or two and a half minutes on the Deep run, and throughput is recorded every quarter of a second, so a slowdown shows as a curve and not as one score.
- Memory measured, not read
- Bandwidth from one thread and from all threads, and the round trip to cache and to main memory, measured rather than copied from a specification.
- Graphics at a fixed size
- A lit scene at a fixed 1600 by 900 and a path tracer at 960 by 540, so the graphics work is the same on every machine and the results compare.
- Nothing installed
- The whole check is a web page. Nothing is downloaded, no account is made, and nothing is uploaded unless you ask for an emailed copy.
What the report says about your system's performance.
The report opens in plain words, then gives every measured figure. It never invents a number a browser cannot measure.
Slowdown
How much speed the processor lost between the start of the load and the end of it, with the shape of the loss: one step down is consistent with a power limit, a slide with heat, and a sensor tool confirms which.
Steadiness
How evenly the work was delivered. A machine that stutters under load shows it here even when its average looks fine.
Memory and graphics
Bandwidth and latency for memory; frame rate, pacing and slowdown for graphics; samples per second for the path tracer.
The likely cause
The run names the most likely reason for a slowdown: a power budget expiring, cooling falling behind, or another program sharing the cores.
Illustrative run. Your own cores draw their own.
Hardware
What it needs. Three tiers, no fine print.
Minimum
Any recent browser
Chrome, Edge, Firefox or Safari, on a laptop or a desktop.
Recommended
Plugged in, other apps closed
On battery a laptop limits itself, and another program on the cores changes the result.
Optimal
The Deep run
9 minutes: a longer processor load, the graphics looped, and a hot re-test.
In short
PC performance test: the answer first
Yes, you can test a PC's performance from a browser tab. This one loads the processor, the memory and the graphics in turn and records how each held up over the whole stage, so the answer is how much speed the machine keeps under work, not the speed of its first second.
Reading your result
- Read the curve before the number
- The processor's throughput is drawn every quarter second. A flat line means the machine held its speed; a line that steps down or keeps falling shows where it gave way, and the report names which shape it saw.
- Treat absolute speed as a floor
- A browser cannot reach the absolute peak of a native benchmark, so the speed figure is a floor. The change over the stage, measured on the same machine in the same browser, is the result to compare.
- Compare like with like
- Run again in the same browser, plugged in, with the same programs closed, and the two curves can be laid side by side. A run on battery or in another browser answers a different question.
What good looks like
The ranges, before you run it.
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.
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.
Processor steadiness
- 90 or more
- Steady
- Work is delivered evenly.
- 75 to 89
- Some unevenness
- Small dips, often background apps.
- Below 75
- Uneven
- Something else may be competing for the processor.
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
PC performance test, answered
- How do I check my PC's performance?
- Run a sustained load and watch what the machine keeps, not just its first second. This test does that in the browser: three minutes across the processor, memory and graphics, then a report in plain words with every measured figure.
- Is this a system performance check for Windows and Mac?
- Yes. It runs in Chrome, Edge, Firefox and Safari on Windows, macOS and Linux, and on Apple silicon. Results compare best between runs in the same browser.
- Is this a performance testing tool for a PC, or for software?
- For the PC. Tools such as JMeter and LoadRunner test how a website or an application copes with many users. This test measures the computer itself: its processor, memory and graphics under load.
- Is this the system check for my online exam?
- No. An exam vendor's system check tests your webcam, microphone, internet and browser settings against its own rules. The free exam system check on this site runs those checks; this page tests the computer's speed.
- Does it work on a laptop?
- Yes, and it is where the test is most useful, because laptops lose the most speed under sustained load. Plug in first: on battery most laptops limit themselves.
- Is the PC performance test free?
- Yes. The run and every measured figure are free, with no account and nothing to install. A one-time payment unlocks the diagnosis section that names the likely cause of a slowdown.
- Is a browser PC performance test accurate enough to act on?
- For the question of whether a machine keeps its speed under load, yes: the change over time is measured on your machine, against itself. For an absolute peak score to compare with a review, use a native benchmark; the browser figure is a floor.