Bug Report preview/encoder drops fps when more than one preview is displayed

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DocTabasco

New Member
since the recent windows update, i have been getting huge framerate drops in OBS Studio any time more than one preview is displayed, including when entering studio mode. This fps drop carries over to the encoder. I've recently discovered that there is a correlation with a sudden change of processing focus between CPU and GPU. Without streaming or recording, when one or no preview is on, OBS CPU use sits at 2% and GPU at 9-12%. As soon as OBS has to display a second preview of any kind (full screen projector, source properties,) CPU jumps to 15% and GPU drops to 3%. I am using an i7-6700K and a GTX 1080 Ti. Why is this happening, and how can I prevent/fix it?
 

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I have the exact same problem, have been pulling my hair out the last few days trying to figure it out and this bug report is spot on. Took me a long time to find this as well.

I noticed though that the problem goes away if I create a brand new scene collection and build from scratch, but at some point (I do not know where) the problem will return (perhaps after the program is restarted?). This is definitely an OBS internal bug.
 
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