How to test sustained performance for remote work
Check whether a laptop slows during a short sustained workload, learn what the result can and cannot tell you, and improve cooling before a remote-work day.
Your laptop may feel fine for a quick task, then slow down during a long video call, a large upload, or hours of browser work. Heat can make a processor reduce its speed to protect itself, a behavior called thermal throttling.
Run the Overheating Test before a busy remote-work day to check whether performance drops during a short period of heavy work. The test can reveal a cooling problem, but it cannot promise that your computer will stay fast through an entire workday.
Test sustained performance
- Open the Overheating Test on the computer you plan to use. Use the same browser and power connection you expect to use during work.
- Save your work and close demanding programs, downloads, and extra browser tabs. This gives you a clearer starting point and helps avoid losing work if the computer becomes sluggish.
- Place the computer on a hard, flat surface with its air vents uncovered. Keep it away from blankets, cushions, and direct sunlight.
- Run the test, which places the processor under a heavy workload for a few minutes. Let it finish unless the computer becomes unusually hot, unstable, or uncomfortably loud.
- Note whether performance stays steady or falls as the computer warms up. If you want to compare a change, let the computer cool first, then repeat under the same conditions after making one adjustment.
For a useful comparison, keep the room, power connection, surface, and open programs as similar as possible. A result from a plugged-in laptop is not directly comparable with one on battery power.
What the result means
Performance stays steady during the test
The computer handled this brief heavy workload without an obvious slowdown. That is a good sign, but not a guarantee for a full day. A long video meeting, multiple monitors, and several open apps can create a different workload and produce more heat over time.
Performance falls as the computer warms up
The computer may be reducing processor speed to control heat. A drop can also come from power limits or the computer's selected power mode, so one test does not prove that a fan or processor is broken. Repeat the test after the computer cools, and check that the vents are clear.
The computer is slow from the start
A low or sluggish result from the first moments may have another cause, such as background tasks, battery-saving settings, or a demanding browser session. Close unnecessary apps and try again. If only one program is slow, the issue may be in that app rather than the computer's cooling.
The test stops or the computer becomes unstable
Stop using the test if the computer shuts down, freezes repeatedly, or becomes extremely hot. A browser workload cannot identify the exact failed part or read every internal temperature sensor. Check airflow and power first, then contact the manufacturer or a repair shop if the problem continues.
How to reduce slowdowns
- Uncover the vents. Use the laptop on a desk or another firm surface, not a bed or couch. Check that papers and cables are not blocking the intake or exhaust vents.
- Choose a suitable power mode. On Windows 11, open Settings › System › Power & battery › Power mode. On a Mac, open System Settings › Battery and review Energy Mode if your model provides that option. Use the normal or automatic mode for routine work, and compare with a higher-performance setting only if you need it.
- Check which apps are using resources. On Windows 11, open Task Manager with Ctrl + Shift + Esc and look for apps using a lot of CPU. On a Mac, open Activity Monitor and select the CPU view. Close only apps you recognize and do not need.
- Reduce unnecessary workload. Close unused tabs, pause large downloads or backups during important calls, and avoid running several demanding apps at once. A browser with many active pages can add heat even when you are not looking at them.
- Use the correct charger. A low-power or incompatible charger may limit performance while the computer is running. Use the original charger or one that meets the manufacturer's requirements, and check whether performance changes when plugged in.
- Restart and update if the problem persists. Restarting can clear a stuck background task. Install operating-system and manufacturer updates through the normal update settings, then retest after the computer has cooled.
When it may be a hardware problem
If the computer slows sharply on repeated tests despite clear vents and a suitable power connection, pay attention to the fan. A fan that does not spin when the computer is hot, makes grinding noises, or runs loudly while airflow feels weak may need service. Dust buildup, a failing fan, or dried thermal material can all affect cooling, but a browser test cannot distinguish between them.
For a computer under warranty, record what happened and contact the manufacturer before opening the case. For an older computer, a repair shop can inspect the cooling system. Avoid repeated full-load tests if the computer is shutting down or getting dangerously hot.
What a short test cannot predict
The Overheating Test runs a heavy workload for a few minutes. A remote-work day is usually a mix of lighter tasks, occasional bursts, meetings, and network activity, so it is not the same as leaving the processor under full load for hours. The test helps reveal a slowdown as the computer heats up, but it does not report an exact CPU temperature or diagnose every cause of poor performance.
The test runs in your browser on the computer being checked. Run it before work, not during a call or while unsaved documents are open.
