Laptop power modes

Laptops adjust performance according to power source and operating system policy. Battery operation can reduce CPU or GPU limits to extend runtime; charging and battery temperature can affect a long run too. Connecting a charger does not necessarily select maximum performance. First record results in your usual mode. Then change either the power connection or the energy setting, and repeat the same benchmark. Record manufacturer utility settings as well as system settings if both exist. Web Bench does not change them for you. Keep ventilation clear and use a firm surface. Battery-mode results are useful descriptions of mobile use, and a lower score does not itself prove a defect.

Before measuring, write down the conditions you want to compare: operating system and browser versions, power connection, energy mode, external display and device model. Wait for downloads, video playback, backups and updates in other apps to finish. Keep the screen on and this tab visible throughout the run. Hiding the tab discards the current round and repeats it when you return, so frequent interruptions create different conditions from a continuous run.

Repeat the measurement two or three times under the same conditions and look at the range rather than selecting only the highest score. Allow the device to return to a comparable state between runs. If a small difference changes direction on repetition, treat it as variation rather than proof of superiority. Check valid test counts and exclusion reasons too. Missing support does not necessarily indicate defective hardware, but it changes what the overall score summarizes.

Change one condition at a time. Changing the browser, power mode and cooling together makes it hard to identify the cause of a difference. Use quick mode to check that the test runs, then use full mode for detailed comparisons. When sharing, include score version, mode, GPU backend and whether AI was included. Read the raw units: higher throughput is usually better, while lower latency is better. Normalized scores account for that direction. Rounded display digits alone cannot establish an improvement. These measurements describe web workloads; they do not guarantee game frame rates, battery life or performance in every desktop application.