OBS causes frametime stuttering

Operating System Info

Windows 11

Other OS

No response

OBS Studio Version

29.1.1

OBS Studio Version (Other)

No response

OBS Studio Log URL

https://obsproject.com/logs/czZELh0u3TKsJ5O0

OBS Studio Crash Log URL

No response

Expected Behavior

No frametime variation by having the application open.

Current Behavior

I get choppy frametimes when OBS is open. I even tried removing all sources and disabling preview while not recording and the issue still happened. This occurred while HAGS was on and off. Tried adding an exception to defender, running as admin, & setting a lower priority/affinity and that also did nothing. I measured the issue using Blur Busters' timing deviation test. The issue only happens when I have OBS open, I even tried recording with Shadowplay and got nothing but green floor.

Here's an image showing the inconsistent frame timings.

Steps to Reproduce

1. Open OBS
2. Minimize the application without recording, disable preview and remove any sources if necessary.
3. Enable hardware acceleration on Google Chrome and run the browser test.
4. Unless you have something else causing issues (like RGB software, commonly) you should have a "green floor" which means perfect frame pacing/timing.
5. If nothing is causing timing issues when OBS is closed, you should see red spikes as I am when OBS is open

Anything else we should know?

No response

Start by reviewing the linked OBS Studio log and reproducing the Blur Busters timing test with OBS open and closed, following the listed steps on Windows 11 with OBS 29.1.1. Compare the conditions that produce the red timing spikes and use the report's expected green-floor behavior as the completion criterion.