I haven’t done any independent research (other than trying it out in a C128 emulator and concluding that it indeed feels very slow 8) ), but there is a detailed

I haven’t done any independent research (other than trying it out in a C128 emulator and concluding that it indeed feels very slow 8) ), but there is a detailed answer here: https://retrocomputing.stackexchange.com/questions/2361/why-does-the-commodore-c128-perform-poorly-when-running-cp-m https://retrocomputing.stackexchange.com/questions/2361/why-... The issue does not seem entirely clear cut, but from the looks of it, while apparently the newer CP/M 3.0 used there does seem a bit slower than earlier versions, the majority of the reasons seem indeed pretty specific to the C128.