That's why you needed it saved with Turbo. it was at least 10 times faster.. I used to have this cartridge... besides turbo it had some more things, it could grab a hardcopy of memory (ie if you were playing a game.. you could save it... and then load it later, it would be in the same state)
https://www.ami64.com/product-page/kcs-power-cartridge-c64
See also https://sqlservercode.blogspot.com/2016/11/what-was-first-co...