CPU Benchmark — Test Your Processor Online

Benchmark your CPU in the browser: a single-core phase, then a multi-core phase across every thread your processor exposes. You get a score you can compare on the leaderboard, plus an optional stress test — from one minute up to 90 minutes — that watches for thermal throttling. No downloads, no signup.

Stress test duration 00:00 remaining

Plug laptops in and close heavy tabs for a fair score. The test loads your CPU fully for the chosen period — fans spinning up is normal, and longer runs are the best way to catch thermal throttling. You can stop a running stress test at any time.

Live benchmark

Ready when you are — click Run CPU Benchmark.

Threads Detected

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Single-Core

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Multi-Core

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Score (live)

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Your CPU score

Total Score

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Single-Core

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Multi-Core

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Rating

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Stress test result

Early Performance

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Final Performance

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Performance Drop

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Leaderboard — top CPU scores

94 scores submitted. Nickname, score and detected hardware only — no accounts, no tracking.

#	Name	Score	Hardware	Date
1	PsychoBunny	38613	32 threads · single 2017 / multi 63011	2026-10-13
2	BKD	37924	32 threads · single 1950 / multi 61907	2026-07-27
3	sak	36835	32 threads · single 1892 / multi 60130	2026-10-17
4	sak	36580	32 threads · single 1900 / multi 59700	2026-10-17
5	sak	35387	32 threads · single 1816 / multi 57768	2026-10-17
6	otto	33366	28 threads · single 1964 / multi 54300	2026-10-05
7	Holy	31551	28 threads · single 1841 / multi 51357	2026-09-25
8	dm	28014	24 threads · single 1958 / multi 45385	2026-10-18
9	R9HX370	27236	24 threads · single 1875 / multi 44143	2026-10-12
10	JJBrewer	26714	24 threads · single 1841 / multi 43296	2026-10-14
11	tre	26585	24 threads · single 1994 / multi 42979	2026-09-27
12	metaAI	26361	24 threads · single 1883 / multi 42680	2026-10-18
13	DM	23201	20 threads · single 1883 / multi 37413	2026-09-10
14	zippy	22979	20 threads · single 1891 / multi 37038	2026-08-12
15	yb	22736	20 threads · single 1691 / multi 36766	2026-10-15
16	yay	22261	16 threads · single 2225 / multi 35618	2026-08-13
17	FPS	21535	20 threads · single 1742 / multi 34731	2026-09-06
18	Ale	20941	16 threads · single 2116 / multi 33491	2026-10-03
19	ss	20326	18 threads · single 1692 / multi 32748	2026-09-17
20	APPLE	20304	18 threads · single 1733 / multi 32685	2026-09-07

About the CPU benchmark

The CPU benchmark runs a fixed mathematical workload inside Web Workers: first on a single thread for about six seconds, then on every thread your browser reports for about eight seconds. The final score weights multi-core 60% and single-core 40%, so both everyday responsiveness and heavy parallel work count.

The optional stress test keeps every thread busy for anything from one minute to 90 minutes and compares performance near the start with performance near the end. A drop of more than about 15% means the processor is slowing itself down to manage heat — the classic sign of dusty fans, dried-out thermal paste or a laptop on a soft surface.

Scores are relative to other runs of this benchmark, not to native tools such as Cinebench. The rating bands below are based on the scores people have actually submitted to our leaderboard, so they reflect real hardware rather than guesses.

What it looks like in use

CPU benchmark leaderboard listing top scores with thread counts and dates — The public CPU leaderboard, built from results visitors have chosen to submit. The thread count and single/multi-core split make it easy to compare like with like.

Understanding your CPU score

The benchmark runs a fixed workload in web workers: one thread for the single-core phase, then every available thread for the multi-core phase. The total score weights multi-core 60/40 over single-core.

Good

A score of roughly 14,000 or more — typical of modern 12–16+ thread desktop and performance-laptop CPUs — with a stress-test drop under 5%.

Average

Roughly 3,500–14,000, which covers most everyday laptops and 4–12 thread desktops, or a mild 5–15% drop in the stress test. Normal for thin laptops, especially on battery.

Poor

Well below what similar thread counts achieve on the leaderboard, or a stress-test drop over 15%. Plug in, switch to a performance power mode, close heavy tabs and re-run; a repeat drop points to cooling.

What this test checks

Single-core throughput — the speed that governs everyday snappiness and many games.
Multi-core throughput across all detected threads — what matters for exports, compiling and heavy multitasking.
A combined score comparable between machines on the public leaderboard.
An optional stress test (1 to 90 minutes) that compares early versus late performance to detect thermal throttling.

How to understand your results

Browser scores are relative, not equal to native benchmarks - compare TestMyPC scores with other TestMyPC scores.
Power mode matters enormously: a laptop on battery can score half its plugged-in result.
A large gap between single and multi-core is normal - it reflects core count more than core quality.
A stress-test drop over about 15 percent suggests cooling problems: dust, blocked vents or ageing thermal paste.

Common problems and fixes

Score much lower than expected

Plug in, set Windows power mode to Best performance, close other tabs and apps, and re-run. Browsers also throttle background tabs - keep the test visible.

Thread count looks wrong

The browser reports logical threads, which may be limited by the OS or browser privacy settings. It cannot always see through virtualisation.

Big drop in the stress test

Thermal throttling. Clean vents and fans, elevate the laptop rear, and consider a cooling pad - then re-test.

Machine feels slow despite a good score

CPU may not be your bottleneck. Check for an old hard drive with our SSD guide, and test RAM pressure in Task Manager.

FAQ

Is a browser CPU benchmark accurate?

It is consistent and comparable between runs and machines in the same browser, which is what a leaderboard needs. Native tools can access more of the CPU but cannot run instantly from a web page.

Why does my score differ between browsers?

JavaScript engines optimise differently, so compare scores from the same browser family for fairness.

Does the stress test damage my computer?

No. It creates normal full CPU load, the same as exporting a video. Thermal protections in every modern CPU keep temperatures within design limits.

What is a good score?

Based on submitted results: 2–4 thread machines usually score 2,500–5,000, 8-thread CPUs around 4,500–9,000, 12–16 threads around 11,000–19,000, and 20+ thread desktops 20,000 or more. Compare against machines with a similar thread count.

How long should I run the stress test?

One minute shows whether performance holds up at all; 15–30 minutes is better for spotting a laptop that throttles once its cooling saturates. Longer runs mainly matter for checking stability after cleaning or repasting.

Why is my single-core score similar to a much faster CPU?

Single-core speed has improved far less than core counts in recent years, so modern chips often sit within 20–30% of each other on one thread. The multi-core phase is where extra cores show up.

Related tools

Browser-based test disclaimer

TestMyPC results are browser-based and may vary depending on your device, browser, operating system, permissions, drivers, connection, power settings and connected accessories. Use these tools as practical first checks, then confirm important faults with operating-system diagnostics, manufacturer tools or a qualified technician where needed.