Warpspeed effect performance

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Hello everyone. Is it normal to have a HUGE performance drop when using warpspeed effect? 60fps without it and 25-27fps with it. 1920*1080 px, GeForce 3070, i7-10700, 32gb ram

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Stupid me. Solved by reboot - vram use 20% instead of 87, fps 59.9-60

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Interesting fact - each time I run scene with Warpspeed effect VRAM consumption is increased by 10%. When scene is changed to a scene without effect VRAM consumption is decreased by 6%. I really hope I won't run out of it before show ends
Currently 53% and 58.3 fps.