[rasz]

> in the end it was about a 10x speedup

10x speedup is what every disk Turbo was doing back in the day, with ActionReplay6 topping off at 5KB/s

https://www.c64-wiki.com/wiki/Comparison_of_fast_loaders standard C64+1541:

    SAVE/LOAD: 374/407 bytes/sec
    SEQ write/read: 349/395 bytes/sec
    Data transfer: 455 bytes/sec

http://tech.guitarsite.de/fastloader.html

Real state of the art is pushed by Krill using technique you describe, and is capable of 20x:

https://csdb.dk/release/?id=189130

Article about one aspect of modern fastloaders - decoding GCR on the fly: https://www.linusakesson.net/programming/gcr-decoding/index....

[egypturnash]

Krill’s 50x loader (requires nonstandard format that’s still copiable by normal copiers): https://csdb.dk/release/?id=197710

[stevep98]

Thanks for the info. I had remembered something like a 17x number but that just seemed like my mind was misremembering.