Question Desktop Windows Manager High GPU Usage when OBS is simply ON (not streaming) ?


Jan 5, 2017
Hey I've been trying to figure out an issue with my stream, a week ago it was working just fine but now suddenly it lags, this is what I mean:

I have a 3070 with an AMD 5800x3d with 32gb of RAM (which I installed 2 days ago) so I think that my setup should be able to handle without major issues. However whenever I simply launch OBS the Desktop Window Manager spikes up to 30-40% GPU usage and when I'm streaming it shows my total GPU usage 100%, keep in mind these are all readings from the Task Manager but Nvidia Experience shows similar numbers.

What can I do to fix this? I've tried installing latest drivers, rolling back to old ones, changing process priorities in the task manager, disabling Hardware acceleration and gaming mode in Windows and a bunch of other stuff but this keeps on happening.. really desperate at this point.

Here is the log from OBS:


Update your post to include full system hardware specs and OS information.

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Try to learn more about what is going on within the setup.

You used Task Manager - that is good.

Also try Resource Monitor and Process Explore (Microsoft, free).

Use all three tools but use only one tool at a time.

Objective being to discover what resources are being used, to what extent (%), and what is using any given resource (i.e. GPU) when the spikes (100%) occur.

Process Explorer:

Another place to look is Task Scheduler: Could be some process being launched via some trigger while/during streaming.


Win 11 Master
Desktop Windows Manager sits between GPU & All applications so any time you use the GPU you are most likely to see it running. Its normal. It is doing its job.

Desktop Window Manager (dwm.exe) is a compositing window manager that renders all those pretty effects in Windows: transparent windows, live taskbar thumbnails, Flip3D, and even high resolution monitor support.

Instead of applications drawing their displays directly to your screen, applications write the picture of their window to a specific place in memory. Windows then creates one “composite” view of all the windows on the screen before sending it to your monitor. Because Windows is compositing and displaying the contents of each window, it can add effects like transparency and window animations when layering the windows for display.