How can i make my settings to get a little bit of fps boost in my game without losing good amount of quality?

[TheLuka]

I want little bit of boost of fps without losing good amount of quality
i like this quality of my video. but it kinda lags. (in roblox)
Is there anyway i can fix lag with settings? or in windows settings
log file:

https://obsproject.com/logs/OBKAm3VWMjLKhNce

Thank you!