Open BroadCaster Software problem with FPS?

I wanted to try streaming on Twitch today, but I have a problem with the FPS when I want to stream. If I click on the game on my second screen Click on the main screen, the FPS on my OBS go below 10 FPS and sometimes it crashes theoretically. So it is not possible to stream.

Which processor do you have?
How high is your upload?
What are your OBS settings?

Without these correct answers one can't help you.

Since the graphics are probably flimsy.

AMD Ryzen 3900X Upload 4-5 MB OBS Settings 3000Kbps 720p 30 FPS

CPU is absolutely okay, upload… Is okay, you can use for 720p
3000 bitrate at 720p & 30 FPS unnecessarily high.

If we assume that you are streaming in VeryFast (Preset), the bitrate will be 1382 + 160 = 1542. Let's round 2000 to a maximum of 2500.

I hope you tried to stream in the x264 codec.
If you want to stream with the H.264 codec or NVEC, please call your graphics card once.

Example of a formula calculation:

Would you now stream eg with 900p 60fps and x264 MediumPreset

(1600 * 900 * 60 * 0.1 * 0.7) / 1000 = 6048 + 160 =
6208

In your case, I took (1280 * 720 * 30 * 0.1 * 0.5) / 1000.