On my desktop i never had lag problem, unless is my pc issue or internet delay.
But the last week i was with my brother laptop and noticed that after a bit you play cpu usage, both with client and browser become too big and the laptop sometimes heat up like mad
then the game slow down really bad.
But on desktop never had this kind of problem, unless i dont clean it for a bit
and the desktop is quite old, like 3,4 years