in handbrake for windows, converting from 1440x1080 H265 to H264 768x576 with nvidia hardware acceleration gives about 200FPS
doing the same with ffmpeg, nvidia hardware acceleration gives a solid 500FPS. that's 20.8x normal playback speed. for a transcode. on a 1660TI, a four year old budget GPU. inside the Windows Sub-system for Linux
i have never seen such shit in my entire life