Can an almost full SSD make games run slower?

I’ve got this question. I have 2 SSDs in my PC, each 1 TB. One of them is already almost full, there’s only 20 GB left before it hits 100%. My question is whether this can hurt performance in any way. Do I need to leave some minimum percentage free for things to work properly?

I haven’t noticed any difference so far, but maybe I’ve just gotten used to it.

I figure if the space is there, it’s meant to be used lol

Right?