Hair render

Hello all,
Lately I was trying to render a realistic human with real particle hair inside cycles.
Everything is good but the render time is consecutively more in every frame.
It starts with 7 minutes and adds like 30 sec or more each frame. Ends up 45 min+ if I leave it all night.
Checked different hair types checked hair bvh on/off in performance but its still there.
Does anyone have a solution to this problem?