Game starts lagging when I start recording in roblox and Minecraft

[NGZMC]

I do limit frames to 60fps in roblox and use vsync in minecraft
Specs:
8GB Ram
Ryzen 7 4700U
No graphics

Log file of Roblox my gpu was on 71%
Log File: https://obsproject.com/logs/hjhO31EmBxT2cgcK

I used x264 VBR 35000Kbps and 16 CRF