When I tested the jumper 3 rendering in handbrake at fast setting a 1080p file, the frame rate was around 6fps. This was done with a thermal mod to run at full 2100MHz the full time. Without thermal mod you are looking at good 4fps.
BUT it all depends on your settings, I can render in x265 and a good quality setting at around 1fps.
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1981 soldered my first Sinclair computer 1K, tapedeck * 1984 build and sold IBM clones 8Mhz, 512K, 20MB HDD * 2018 messing with ultrabooks