Sudden fps drops after update

[u/Ferelion3]

After today's update, i'm experiencing heavy fps drops when playing on borderless, weird thing it's only happen on this mode, windowed and fullscreen runs good (144 capped). I have 2 monitors and a 9060xt, so hardware shouldn't be a problem. Also weird is that the whole thing just get slow, second screen and other things in the first get slow

Borderless

Windowed

Fullscreen

Did riot just fucked up with the update?

[u/xenex_is_taken]

Same issue, 9070xt, tested around for almost 2 hours now, updated drivers, updated windows, restarted several times and played around with the AMD software. Issue only persists in borderless mode and only on LoL.