When playing in borderless window mode game stutters after first match

[Emil.popj]

It seems that when playing in borderless window mode the game starts lagging increasingly in matches. At the end of the first 40 minute game theres some stuttering but by the end of the 2nd game it is unplayable. I dont know what would be the cause of this but its worth a shout

 

[PandoraFiveStars]

Lots of people been having problems with performance, myself included. I hope they fix it asap because I literally can't play the game rn.