laptop with 8gb ram nvidia 740m and i7 only gives 30-40 fps on dota 2

Feb 16, 2018
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i used to have 120-130 fps while i was playing dota 2 since 7.00 i get only 30-40 fps
my laptop asus k46c-b core i7 8gb ram and nvidia 740m 4gb windows 8.1
i set my game to run with nvidia high performance and already updated driver and tried vulkan and open gl none worked!
can anyone help me? idk what else can i do.