What does disable client rendering do?

[LeBron]

I know low CPU mode makes your computer use a lot less CPU but what does the other one do? Less RAM? Side affects of using it? 

EDIT: Just tried checking the box and my OSBot screen went black but I could see HP bars lol. What does this do performance wise?

Edited May 17, 2018 by LeBron

[ez11]

didnt really do anything when i tried it. same with low resource mode.

only low cpu seems to have a notice impact for me