Teams freezes when sharing screen

The short answer

When Teams freezes during screen sharing, the usual cause is that the computer or the network connection can't keep up with everything the call is doing at once. Teams has to capture and compress your screen, send your webcam video, process your microphone audio and decode other participants' streams, all at the same time. Start by reducing that load: share a single window instead of the whole desktop, turn off your outgoing camera video while presenting, close demanding apps, and check your graphics driver and Teams' hardware acceleration behavior. One limit applies: no test data was supplied that pins down the cause for any particular computer, webcam or network. Treat the steps below as a checklist that rules out causes one at a time, not as a guaranteed fix.

Why screen sharing puts so much strain on a call

A webcam feed is a fairly predictable video stream. A shared screen is not. It may be a high-resolution display, it may contain small text that has to stay legible, and it can switch suddenly from a static slide to scrolling or a playing video. Each change has to be encoded, meaning compressed into a format small enough to send, before it goes over your upload connection. That encoding work runs alongside your camera video and your audio processing. If the processor, the graphics hardware or the upload bandwidth hits its limit, something has to give, and what gives can look like a freeze.

Identify which kind of freeze you have

The phrase "Teams freezes" covers several different symptoms, and each points to a different place to look. The table below is a general diagnostic guide based on how conferencing software uses system resources. It does not report measured results.

Symptom | What it most often points to | First thing to check

The whole Teams window stops responding on your own computer | The app is short of resources, or there is a graphics or driver conflict | Restart Teams, update the graphics driver, check hardware acceleration

Your screen looks fine to you, but others see a frozen or stuttering share | Upload bandwidth or encoding can't keep up | Turn off your camera video, share one window, pause other uploads

Your webcam image freezes as soon as sharing starts | Processor load, or the webcam's connection is struggling | Close heavy apps, try a different USB port that connects directly to the computer

Your voice turns robotic or drops out at the same moments the video freezes | Processor or network saturation is reaching the audio path too | Reduce video load first, then use a wired connection if you can

Everything works at first but degrades after a long session | Heat, power-saving limits or growing memory use | Connect to mains power, check the power mode, restart Teams before long meetings

What this means for your webcam microphone

A microphone built into a webcam usually shares the same USB connection and internal electronics as the camera. In normal use that causes no trouble. When the system is already under heavy load, though, the same bottleneck that stalls the video can also interrupt the audio. Problems are more likely if the webcam sits on an unpowered USB hub or shares a hub with other bandwidth-hungry devices such as external drives or capture cards. They may only show up during the load peaks that screen sharing creates.

There is a more basic point too. Teams is the application sending your voice. If the Teams app itself hangs, your audio stops reaching the meeting no matter which microphone you use. A better microphone cannot fix an application freeze. It can only help when the audio problem comes from the capture device or its connection.

If your speech needs to stay clear while you present, these options help:

• Turn off your outgoing camera video while sharing but keep the webcam microphone selected. When the camera is off, Teams typically stops pulling the video stream, which reduces processing and connection load while your voice still comes through the webcam mic.
• Switch the audio input to a headset or separate microphone. This takes the camera's shared connection out of the audio path and can help you tell whether the webcam is part of the problem.
• Use the "include computer sound" option only when you need to share audio. Sharing system audio adds processing work. If you listen through speakers, the webcam microphone can also pick up that played-back sound and cause echo.

Steps to try, in order

• Share a specific window or app rather than your entire screen. This reduces the amount of changing content Teams has to encode.
• Turn off your outgoing camera video while you present, and turn it back on afterward.
• Close apps that use a lot of processor, graphics or network capacity, especially browser tabs playing video, cloud sync tools and large downloads or uploads.
• Update Teams, your operating system and your graphics driver. Rendering and encoding problems often come from the graphics layer.
• Check whether Teams offers a hardware acceleration option in your version, and test the opposite setting. On some systems offloading work to the graphics processor helps. On others, a driver problem makes it the cause of the freeze.
• On Windows computers with two graphics processors, Windows display settings let you choose which one an app uses. Assigning Teams consistently to one processor can rule out switching problems.
• Plug the webcam directly into the computer rather than through a hub, and avoid hubs shared with other heavy USB devices.
• Use a wired network connection if possible, or move closer to the Wi-Fi access point. Screen sharing depends heavily on upload capacity.
• If the problem persists, sign out of Teams, quit it fully, and restart the computer before trying again.

Freezes that only appear in long sessions

Freezes that start well into a meeting rather than at the moment you begin sharing suggest that something builds up over time. Laptops can slow the processor as they heat up to protect the hardware, which is known as thermal throttling. Battery-saving modes can also cap performance. Long-running apps can gradually use more memory. For long presentations, plug in a laptop, choose a balanced or performance power mode, keep the vents clear, and restart Teams shortly before an important meeting rather than leaving it open for days.

A frozen share or a missing share?

A blank or black shared screen is a different problem from a freeze. On macOS, for example, Teams needs Screen Recording permission in the system privacy settings before it can share your screen. Without that permission, others may see nothing at all instead of a stalled image. If the shared screen has never appeared, check permissions before working through performance fixes.

Gaps in the available evidence

No confirmed evidence specific to this topic was available: no benchmark figures, no tested webcam models, no bandwidth thresholds and no version-specific bug reports. The guidance above rests on general principles of how conferencing software uses processor, graphics, USB and network resources. It does not say which cause is most common, how much upload bandwidth a given share needs, or whether a particular Teams release has a known freeze issue. If the steps above don't resolve the problem, check your organization's IT support or Microsoft's official Teams support channels for current known issues affecting your version.