When repeated load tests are a bad idea

A computer getting hot or slowing down can make you want to run another test to see if the problem happens again. But repeating a full-load test adds heat and power draw, which is not a safe way to investigate hardware that may already be damaged.

The Overheating Test puts the processor under full load for a few minutes to see whether performance slows as the device heats up. Use it only when the computer seems physically sound and the problem is limited to performance under load. If you see warning signs such as a swollen battery, burning smell, smoke, or sudden shutdowns, skip the test.

Decide whether it is safe to test

1. Look over the device before starting. If the case is bulging, a battery looks swollen, you smell burning, see smoke, hear a grinding fan, or the computer has recently shut off unexpectedly, do not run a load test. Go to the hardware advice below instead.
2. If there are no warning signs, open the Overheating Test on the computer you want to check. The test measures behavior on that device, not on another computer nearby.
3. Put the computer on a hard, flat surface with its vents unobstructed. Close demanding apps so they do not add extra work, and stay nearby while the test runs.
4. Run one test and watch for unusual behavior. If the device becomes unusually hot very quickly, slows sharply, makes a new grinding noise, freezes, or shuts down, stop the test if the browser still responds. Do not restart it to confirm the same symptom.
5. Let the device cool before using it normally. Note what happened and when, such as whether the slowdown started after a few minutes or the fan began making a new noise.

What the result means

Performance slows during the test

The computer may be reducing its speed as it heats up. This is called thermal throttling. It can happen when cooling cannot remove heat quickly enough, but one result does not tell you whether the cause is dust, blocked airflow, a fan problem, or another fault. Do not keep repeating the test to chase a bigger slowdown. First check the simple airflow issues below.

Performance does not slow down

That is reassuring for this short test, but it does not prove the computer is healthy. The test does not inspect fan bearings, the battery, internal connections, or physical damage. A problem that appears only during a longer task or in a particular app may also not show up during this run.

The computer freezes, restarts, or shuts off

Treat an abrupt failure during a load test as a reason to stop, not as a reason to run it again. A crash can have more than one cause, and repeating the same stress may make a hardware fault worse or risk losing unsaved work. Save any notes about the event and arrange a safer diagnosis.

You notice a burning smell, swelling, or smoke

Stop using the device. If it is safe to do so, disconnect its charger or other external power, and do not charge it again. Do not press on a swollen case or try to remove a built-in battery. Contact the manufacturer or a qualified repair service.

What to do instead of repeating the test

1. Stop adding load. Close demanding apps and let the computer cool on a hard surface. If the smell, noise, instability, or unusual heat continues while idle, shut it down and leave it off until it can be checked.
2. Check for blocked vents. Move the computer away from blankets, cushions, and piles of papers. Check that nothing is covering the intake or exhaust vents. Do not push objects into the vents.
3. Look for a background app using the processor. On Windows 11, press Ctrl + Shift + Esc to open Task Manager and check the Processes list. On macOS, open Applications › Utilities › Activity Monitor and check the CPU tab. Close an app you recognize if it is doing unnecessary work, then see whether the computer settles down without another stress test.
4. Reduce performance temporarily if the computer is stable. On Windows 11, go to Settings › System › Power & battery and choose a less aggressive power mode if that option is available. On a Mac laptop, check System Settings › Battery › Low Power Mode. These settings can reduce power use, but they do not repair damaged cooling or make a visibly damaged device safe to test.
5. Get help if the symptom returns during normal use. Check the manufacturer's support and warranty options, especially for a laptop that is still covered. Describe the symptom and when it occurs rather than running more tests to produce it again.

When it may be hardware damage

A warm case and a louder fan during a demanding task can be normal. More concerning signs include a fan that scrapes or grinds, repeated sudden shutdowns, a case that is bulging, a burning odor, or heat that continues to build while the computer is idle. A recent drop, liquid spill, or repair also makes repeated load tests a poor first step.

If any of these signs are present, stop using the device and ask the manufacturer or a repair shop to inspect it. A failing fan or damaged battery needs attention, not another browser test. If the device is under warranty, contact support before opening it, since opening it yourself may affect coverage.

What a browser load test cannot tell you

The Overheating Test checks whether the computer slows down under a short, heavy workload. It is not a full hardware inspection and cannot identify which part is damaged. A normal result is not a guarantee that the computer can safely handle repeated stress, especially if it has already shown physical warning signs.

Repeated tests are useful only when the device is stable and you have a specific, low-risk question to answer. If a test causes a new symptom, stop there and choose inspection or repair over another run.