Have you tried it? I just installed gamescope and launched some games with it via steam launch options. So far I feel like the frame times are better. I use it on top of KDE and with an AMD card. Freesync in Gamescope works too. (Have it allways on in KDE if that matters).
I’d like to but it causes some of my games to be kinda jittery. The only games I tolerate the jitter are Saints Row 3 & 4 because it fixes an issue i have with them otherwise.
Whats wrong with saints row 3 and 4 ?
When I would use the mouse the framerate would dip down to about 20. Gamescope was a real life saver on that one because I was out of the refund period when I was finally able to play them.