я в кастомки не играю, но только что проверил, да, на некоторых проседает (например на странице custom hero chaos), на других нескольких нет.
если стоит на вкладке about тормозит и в консоли спамит:
Excessive frame time of 100.07ms clamped. Acting as if the frame only took 100.00ms
Excessive frame time of 102.95ms clamped. Acting as if the frame only took 100.00ms
Excessive frame time of 100.30ms clamped. Acting as if the frame only took 100.00ms
Excessive frame time of 100.40ms clamped. Acting as if the frame only took 100.00ms
Excessive frame time of 100.59ms clamped. Acting as if the frame only took 100.00ms
но если переключить на updates, то фпс в норму приходит.
beta...