Problems with sharp drop in fps in CS2 freeze lag (webcam??)

Welcome! Built a new computer at the beginning of December last year. Pretty much just playing CS2. It has been averaging 300-290fps (locked at 300fps) since its inception. Then I tried streaming a few weeks ago, and a few days went as best as it could, and the FPS stayed the same. I bought a new microphone, webcam, streamdeck and xlr. After I bought it I started bouncing up and down like hell on the fps, and I get a frozen lag that now fluctuates between 250-140fps sometimes and lags severely sometimes. If I pull the camera out, I don't experience the same lag but there's still a significant drop in FPS, which I've never done before. I was in contact with Inet support today and they asked me to update the drivers, tried reinstalling the elgato software, changed the USB port and turned off g-sync, which I did with no improvement. I've been advised to write here about the tips, so I thought I'd test here if anyone has an idea what could be the cause. Completely useless when it comes to things like this. But if there is more information you might need, write it down, and I will try to solve it.

Any tips appreciated..

When I streamed, I streamed through Streamlabs, tried OBS as well but it didn't make any difference.

Computer specifications:

GPU: ASUS ROG Strix GeForce RTX 4070 Ti.
CPU: AMD Ryzen 9 7900X.
RAM: Kingston Fury DDR5 5600MHz 32GB.
M.2: Kingston KC3000 M.2 2280 NVMe SSD 2TB.
Motherboard: NZXT N7 B650E.

Let's go:

Main Monitor: ASUS TUF VG27AQML1A 27-inch – 2560 x 1440 (QHD) – 240 Hz.
2 ASUS 144HZ which is set to 60Hz now.
Face camera: Elgato Facecam MK.2 1080P60.
XLR:lgato wave XLR.
Microphone: Logitech Yeti Studio.
Elgato Stream Deck+.