Unread server animation causes high fps drops

[X3oWyR]

Discovered that while using rainbow as unread server animation, my fps in csgo drops from ~250 to ~150. After changing it to none, the fps are back to normal. My specs are i7 7700hq, 1060 6gb, 16gb ram. Didnt try any other game for this issue. In task manager, processor usage changes from ~4,5% to ~8%, gpu usage from 0,1% to ~2%