What to look for
A line that stays level
A persistent step down can be consistent with thermal throttling, a power limit, battery saver or competing background work.
CPU load & stability check
CPU Load Test
Put one or more logical processor threads under a controlled browser load and watch whether throughput holds steady or falls over time.
This is not a benchmark. The passes-per-second figures are produced by this browser, on this machine, during this run. They are useful for comparing the machine against itself over time, not against another computer or a leaderboard.
Test setup
Choose how much of the processor the browser should keep busy.
Run length
Browser reports
4 threads
Selected
All reported threads
Live stability
Warming up
Give the run a few seconds before judging it.
Elapsed / target
0:00 / 5 min
Current throughput
0
passes/s
Peak
0
passes/s
Average
0
passes/s
Change from early run
—
lower
Throughput over this runRead the line against itself, not another PC
Blue: current throughput
Single vs multi
Different questions
One thread is a lighter sustained load. All reported threads are more useful for checking cooling response and stability under heavy browser work.
Browser limits
What we cannot read
A web page cannot reliably read CPU temperature, clock speed or fan RPM. Use a local hardware monitor if you need those values.
Keep this tab visible while testing. Browsers can throttle background tabs.