Test a laptop before browser video calls

A browser video call can fail in several ways: the picture may freeze, your voice may cut out, or the laptop may get hot and sluggish. Testing the parts separately helps you find problems before you join an important meeting.

Use the Processor Test to check how your laptop handles a browser workload, then test the camera, microphone and connection. These checks do not guarantee that every video service will work perfectly, but they can reveal common problems early.

Check your laptop before a call

Open the Processor Test on the laptop you plan to use. Run the test once and note the single-core and all-core scores. Keep the laptop on a hard surface, and stop if it becomes unusually hot.
Open the Camera Test and allow camera access when your browser asks. Check that the preview shows you clearly, then note the resolution and frame rate.
Open the Microphone Test, choose the microphone you plan to use and press Start microphone. Speak at your normal call volume. The meter should move and the status should change to Sound detected. Use Record 5 seconds and play it back to check that your voice sounds clear.
Run Connection Stability for a few minutes on the same network you will use for the call. Look for lost requests, dropouts, or large changes in response time and jitter.
If your connection seems slow, run the Speed Test once as well. Check download and upload speed, then open your actual video service and test its camera and microphone preview if it offers one.

For a fair check, use the same browser, laptop position, Wi-Fi network and accessories you expect to use in the call. Close other video meetings and large downloads, but do not close the browser tab running a test.

What the results mean

The processor score is lower than you expected

The Processor Test reports single-core and all-core performance as scores out of 100. A low or inconsistent score can point to background work, power saving, heat or a browser issue. It is not a pass-or-fail test, and there is no single score that guarantees smooth video. Compare results on the same laptop under similar conditions rather than treating the score as a rating of every video call.

The camera preview is clear and steady

The browser can access the camera, and the preview gives you a basic check of its image and reported frame rate. A sharp preview does not guarantee that a call will look identical: the video service may reduce quality when the connection is weak or the laptop is busy.

The microphone meter moves, but playback sounds wrong

The laptop is receiving sound, but the selected microphone, input level or audio processing may need attention. If playback is silent, muffled or distorted, test the other available microphones and check the app's audio settings before blaming the laptop.

The connection has dropouts or unstable response times

Brief losses or large changes in jitter can interrupt live audio and video even when a short speed test looks fast. If the results are steady but the call still struggles, the video service, browser or another device using the network may be involved.

Fix the problems you find

Close apps and tabs you do not need. Video editors, games, many browser tabs and other calls can compete for processor time. Restart the browser before your meeting if it has been open for a long time.
Keep the laptop cool and check its power mode. Use a hard, flat surface and leave the vents clear. On Windows 11, open Settings › System › Power & battery › Power mode. On a Mac, check System Settings › Battery and turn off Low Power Mode if it is limiting performance and you need more speed.
Allow camera and microphone access. In your browser, open the site permissions from the icon beside the address bar and allow the camera and microphone for your video service. On Windows 11, check Settings › Privacy & security › Camera and Settings › Privacy & security › Microphone. On a Mac, check System Settings › Privacy & Security › Camera and System Settings › Privacy & Security › Microphone.
Select the right devices in the call settings. A laptop may have a built-in camera and microphone as well as a USB headset or webcam. Choose the device you tested in the video service's audio and video settings, then check its preview again.
Improve the connection. Move closer to the router, use a wired connection if available, or pause large downloads and uploads. If the connection drops only on Wi-Fi, compare the result near the router before changing other settings.
Update and restart the browser. Install browser updates, restart the laptop if problems persist, and retry the tests. If only one video service fails, check its site permissions and try its supported browser.

When it may be a hardware problem

If the camera or microphone fails in its browser test and in more than one app, disconnect and reconnect external devices, then test them on another computer if possible. A camera that remains blank or a microphone that stays silent on another device may be faulty. Check the warranty on an external accessory; for a built-in camera or microphone, ask a repair shop to inspect the laptop.

What these browser tests cannot predict

The Processor Test measures browser-based CPU performance, not the exact workload of a particular video service. Likewise, the camera and microphone tests check browser access, not every feature the service may use. Video calls also change quality to suit the available connection, so test the actual service when you can, especially before a presentation or interview.

The camera and microphone tests ask for permission before using those devices. The tests run in your browser, and nothing you record is uploaded.