How to compare CPU speed before and after heating

Your computer may feel fast when you first start working, then slow down after a game, video export, or long call. Heat can make a processor reduce its speed to protect itself, but a single benchmark score cannot confirm that is what happened.

Compare the same CPU test before and after sustained load. The Processor Test gives single-core and all-core scores, while the Overheating Test puts the processor under full load for a few minutes to see if it slows down when hot.

Compare CPU speed before and after heating

1. Open the Processor Test and run it once while the computer is relatively cool. Note the single-core and all-core scores, and whether the computer is plugged in.
2. Open the Overheating Test and run its full-load test for a few minutes. Keep the computer on the same surface and in the same room.
3. As soon as the heat test finishes, run the Processor Test again. Use the same test conditions and compare both scores with your first results.
4. Let the computer cool, then repeat the Processor Test once more. This gives you a useful check on whether performance returns after the heat load ends.

Close demanding apps before starting, but do not change your power mode, charger, or browser between runs. Keep notes of the scores and conditions. A repeatable comparison matters more than one unusually high or low result.

What the results mean

The scores are close

A small difference can happen from run to run. Background tasks, power settings, and normal benchmark variation can all affect a score. If both scores are similar across repeated comparisons, the test has not shown a clear performance drop under heat.

The score drops after the heat test

A lower score after sustained load can mean the processor is reducing performance as it gets hot. This is called thermal throttling. It is a protective response, not by itself proof that a part is broken. Check whether the result repeats under the same conditions and whether the score recovers after the computer cools.

The score returns after cooling

If the score falls after the heat test and rises again after cooling, heat is a likely factor. Poor airflow, a blocked vent, a hot room, or a demanding background task can contribute. The tests show a change in performance, but they do not identify which physical part or condition caused it.

The score is low both before and after

Heat may not be the main reason for the result. A battery-saving power mode, a background update, or a different power limit can hold performance down even when the computer is cool. Compare the device under consistent power and workload conditions before drawing a conclusion.

The heat test slows down, but the scores vary

The Overheating Test applies sustained load, while the Processor Test measures performance in its own benchmark runs. They do not measure exactly the same workload. Treat the two tests as complementary evidence, and repeat the comparison if the results are unclear.

How to make the comparison fair

1. Keep power conditions the same. If you start plugged in, stay plugged in for every run. On Windows 11, check Settings › System › Power & battery › Power mode. On a Mac, check System Settings › Battery and keep Low Power Mode in the same state for each comparison.
2. Give the computer room to breathe. Place a laptop on a hard, flat surface, not a bed or blanket. Keep vents clear, and do not cover the desktop computer's intake or exhaust.
3. Close heavy background work. Pause games, video exports, large downloads, and software updates before the baseline test. A task starting in the background can lower the score without any change in processor temperature.
4. Use the same browser and test sequence. Run the baseline and follow-up in the same browser, with the same Processor Test. Avoid switching between single-core and all-core results when comparing.
5. Repeat a surprising result. If a score drops sharply once, let the computer cool and try again. A second consistent drop is more useful evidence than a single run.

When it's a hardware problem

Stop the test if the computer becomes unusually hot, shuts down, or repeatedly freezes. Check that the fans can turn and that the vents are not blocked. If performance drops consistently even with clear airflow and a cool room, or the computer shuts down under ordinary work, contact the manufacturer or a repair shop. A benchmark cannot tell you whether the cause is a fan, dust inside the case, or another cooling problem.

What a CPU score can and cannot tell you

The Processor Test gives a score out of 100 for its CPU performance checks. Use that score to compare runs on the same computer, not as a direct temperature reading or a guaranteed comparison with a different computer. Different processors, power limits, and cooling designs can produce different scores.

The useful question is whether your own computer performs noticeably worse after sustained load, and whether it recovers once it cools. Keep the room, power, and background activity consistent so the comparison points to heat rather than a change in conditions.