questions about B650 Gaming X AX V2

so everytime i boot up my computer, the fans spin at full speed with the bios and dram lighting up but the system actually posts but it takes a bit of time to boot up (like 5 seconds longer than i wish for) and sometimes it takes a little longer to boot up, from what ive read this is memory training but how do i disable it? i saw some people report crashes when disabled, is this still the case? my bios version is f30 if that matters and i do have expo enabled which i heard slows down boot times