In the video I review and show in action a DIY turbo card 68EC020-TK. This is a card with 68EC020 CPU, fast memory and IDE controller, it speeds up Amiga more than 10 times.
Original project by Matthias Heinrichs (Matze), documentation from https://gitlab.com/MHeinrichs/68EC020-TK

In my opinion this is the best turbo card for A500... at least among those you can make by yourself.