Timing Warning

I never played the original game in the arcades so I am not sure what this warning means (see attachment). The game is Mushihime-Sama Futari Black Label (futaribl).

I know these games have some slowdown when the screen is full of bullets so you can avoid them with more ease. Does this mean there is no slowdown or is it something else?

Thanks.

https://github.com/mamedev/mame/blob/7da34d5e7d1c062b894e0c0c5d7fc1d20341898c/src/mame/cave/cv1k.cpp#L182

Timing
 - Correct CPU slowdown emulation and flags (and speed of RAM). Most slowdown seems due to SH-3 uncached RAM access wait states, which is not implemented.