Why Is My Webcam Lagging? How to Find the Cause and Fix It

The short answer

A webcam usually lags because something between the camera sensor and the screen can't keep up. Common causes are dim lighting, a weak USB connection, a computer that is overloaded or overheating, video effects that need extra processing, a browser or app setting, or a network that can't carry the video smoothly to the other people on a call. The fastest way to narrow it down is to check whether the video lags in your computer's own camera app. If it lags there, the cause is local: the camera, its connection, lighting or your computer. If it looks smooth there but lags in a call, look at the calling app, the browser or your network.

What kind of lag are you seeing?

Lag can mean several different things, and each points to a different cause. Decide which one matches what you see before you change any settings.

• Choppy or stuttering video: motion looks jerky because fewer frames per second are reaching the screen.
• Delayed video: movement is smooth but arrives late, such as a wave that appears a moment after you make it.
• Freezing: the picture stops for a while, then jumps ahead or recovers.
• Video out of sync with audio: your lips and voice don't line up for the people watching.
• Lag that builds over time: the call starts smoothly and gets worse after a while.

Also note where the lag appears. Your own preview, the small self-view in a call, and what other people receive are not the same thing. A smooth self-view doesn't prove that others see smooth video, because their copy has been compressed and sent over the network.

Before you start

• Close any calls or apps you don't need, so you can test with a clean slate.
• If you use a laptop, plug it into power.
• Keep the camera plugged in the way you normally use it, so the first test reflects your usual setup.
• Note which app or browser lags and roughly when the lag starts. You will compare against this after each change.
• Change one thing at a time, so you know which change made the difference.

Step 1: Check the video outside your calling app

Open the camera viewer built into your operating system. That is the Camera app on Windows and Photo Booth or QuickTime Player on a Mac. On Linux, any basic webcam viewer will do. Close the calling app and any browser tabs that use the camera first, because some systems let only one app use a camera at a time. Wave your hand slowly and then quickly, and watch for stutter or delay.

• Laggy here too: the cause is local. Continue with Steps 2 to 5.
• Smooth here but laggy in your call: the camera and connection are probably fine. Skip to Steps 5 to 7.
• Camera not available or a black screen: that's an access or detection problem, not lag. Check the camera permissions in your operating system and browser before you go further.

Step 2: Improve the lighting

In dim light, many webcams automatically keep the shutter open longer for each frame so the image is bright enough. That can lower the frame rate and make movement look choppy or blurred, even though nothing is broken. Turn on a room light or face a window, then check the preview again. If motion gets smoother, lighting was at least part of the cause. Some cameras let you turn off a low-light or auto-exposure setting in their own software, but not every model has one.

Step 3: Check the connection

• Plug an external webcam directly into the computer instead of through a hub, dock or extension cable.
• Try a different USB port. If your computer has both older and faster USB ports, try a faster one, because higher resolutions need more bandwidth.
• Unplug other high-bandwidth USB devices on the same hub, such as external drives or capture devices, and test again.
• If the cable is detachable, try another cable that you know works.

If the lag goes away after one of these changes, the connection was limiting the video. If the camera disconnects and reconnects during a call, that's also a sign of a cable, port or power problem.

Step 4: Reduce load on the computer

Live video has to be captured, processed, compressed and displayed all at once. If the processor or graphics chip is busy with other work, frames get dropped. Open Task Manager on Windows or Activity Monitor on a Mac while the camera is running, and look for apps using a lot of processor or memory. Close extra browser tabs, other video apps, games, and large downloads or backups, then check the preview again.

Step 5: Turn off video effects

Background blur, virtual backgrounds, filters, face retouching, auto-framing and similar effects analyze every frame, which takes extra processing power. These effects can come from the calling app, the webcam maker's software or the operating system. Turn them all off and test again. If the lag disappears, you can either keep the effects off, use a simpler one such as blur instead of a full virtual background, or replace it with a tidy physical background. A real backdrop needs no processing.

Step 6: Compare apps and browsers

• If the call runs in a browser, try the same call in a different browser, or in the service's desktop app if one exists.
• Update the browser and the calling app. Restart them afterward.
• If your browser has a hardware acceleration setting, check whether it's on. Turning it on lets the graphics chip share the work, but if lag started after you turned it on, try turning it off.
• In the calling app's video settings, check which camera is selected. Some computers have both a built-in camera and an external one, plus virtual camera drivers from other software.
• If the app lets you choose a lower resolution or turn off HD video, try that.

If one app or browser lags and another doesn't, the problem lies in that app or browser's settings or version, not the camera.

Step 7: Check the network when others see the lag

If your preview is smooth but other people say your video freezes, looks blocky or falls out of sync with your voice, your upload connection may not be keeping up. Video calls send your video out continuously, so upload capacity and stability matter more than download speed here.

• Use a wired Ethernet connection if possible, or move closer to the Wi-Fi router.
• Pause cloud backups, file syncing, large uploads and streaming on your device and on other devices sharing the same connection.
• If the calling app shows connection or call statistics, check them during the call for signs of a poor connection.
• Ask someone on another network whether they also see the problem. If only one person does, the issue may be on their end.

When lag builds up during long calls

If video starts smooth and gets worse after a while, look for something that changes over time rather than something set wrong from the start. Possible causes include:

• Heat: laptops and some webcams slow down to protect themselves as they get hot. A laptop on a soft surface or with blocked vents heats up faster.
• Power saving: on battery, or in a power-saving mode, the computer may lower its performance during a call.
• Background tasks: updates, backups, antivirus scans or syncing may start partway through a session.
• Memory build-up: a browser or app that has been open for a long time, with many tabs, may slow down.
• Network changes: other people on the same connection may start streaming or downloading during your call.

To test this, run the camera preview or a test call for as long as your usual calls last, and keep Task Manager or Activity Monitor open. Plug in the laptop, choose a balanced or high-performance power mode, give it room to cool, and restart the browser or app before important calls. If the lag stops building up, one of these factors was the cause.

Step 8: Update or reinstall drivers and firmware

If the lag shows up even in the operating system's camera app and the steps above didn't help, install pending operating system updates and restart. On Windows, you can also open Device Manager, find the camera, and update the driver or uninstall it and restart so it reinstalls. If your webcam maker offers software or firmware updates, install them from the maker's own support page. Retest in the operating system's camera app afterward.

Quick reference: symptom, likely area, next step

What you see | Most likely area | Try next

Choppy in the OS camera app, better in bright light | Lighting and auto-exposure | Add light in front of you

Choppy in the OS camera app regardless of light | USB connection, computer load or drivers | Change port or cable, close heavy apps, update drivers

Smooth in the OS camera app, laggy in one app or browser | App or browser settings | Turn off effects, update, try another browser or the desktop app

Smooth locally, others see freezing or blocky video | Network upload | Use a wired connection, pause uploads, check call statistics

Gets worse the longer the call runs | Heat, power saving or background tasks | Plug in, cool the device, check for tasks that start mid-call

Laggy on every computer you try | The camera itself | Contact the manufacturer or replace the camera

How to know the fix worked

Repeat the same check that first showed the lag, in the same app and under the same conditions. Each test proves something different:

• A smooth preview in the OS camera app shows that the camera, its connection and the computer can deliver smooth video. It doesn't test the calling app or your network.
• A smooth self-view inside the calling app shows that the app is getting good video locally. It doesn't show what others receive.
• A test call or recording with someone on another network checks what viewers actually see, including compression and network effects.
• A session as long as your usual calls is the only way to confirm that lag no longer builds up over time. A short test can pass even when a long call would still slow down.

Limits that could change your decision

Some fixes depend on what your setup supports. Not every calling app lets you pick resolution or frame rate, and not every webcam has its own settings software. Effects such as virtual backgrounds and auto-framing may run slowly or not run at all on less powerful computers, and options can differ between an app's browser version and its desktop version. Check the documentation for your specific app and camera rather than assuming a setting exists.

If you use an online webcam test site to check your video, it needs camera permission from your browser. Before you grant it, check that site's own privacy information for whether video is processed only on your device or uploaded. You can remove the permission in your browser's site settings when you're done. The built-in OS camera app avoids that question for local checks.

When to get further help

• If the camera lags in the OS camera app on more than one computer, in good light, with a direct connection, the camera is the likely cause. Contact the manufacturer or consider replacing it.
• If any camera lags on one particular computer, look at that computer's performance, USB ports, drivers or overheating, and consider asking its manufacturer or a technician.
• If lag happens only in one calling service after the checks above, contact that service's support with details of when it happens and what you've already tried.
• If others consistently see freezing despite a smooth local preview and a wired connection, your internet provider may need to check your connection.

Note: this guide doesn't give target frame rates, resolutions or upload speeds, because no verified figures were available for any particular camera, app or connection. For exact requirements, check the documentation for your webcam and calling service.