It can be two things

Ask and you shall receive fellow lover of lock on technology ™️

Unfortunately I don’t have a genesis Game Genie or Action Replay to really spice it up

They have been here in the US for a long time, I think their first american store opened in the 70s. Personally I love Aldi I shop at my local one here in Missouri at least once a week. Their price on extra firm tofu just can’t be beat its at least 1/3 the price it is at my other local supermarkets.

Depending on your hardware you should be able to have Handbrake use your GPU to reencode the video much faster than your CPU. If you have Nvidia it would be Nvenc, Intel is Quicksync, and AMD is VCE. If you select one of those as your codec it should go much faster. Check the hardware encoders section on the Handbrake documents https://handbrake.fr/docs/en/1.4.0/technical/video-nvenc.html . Even if you were using windows you would run into the same problem at some point you are limited by how fast your hardware can process the video and no software can make up for that.