Hi,
This is each time i load the same song, just BIAB (x64) 2019 and 2018 loading the same MGU.
It is unclear if you are talking about the program bootup time or song generation time. Here it sounds like you are talking about song generation. If you are talking about program bootup, that should be a little bit faster with the latest build of Band-in-a-Box 2019.
If you are talking about song generation time and comparing the same song, it should be roughly the same *provided* you have all the same settings. One setting to check is RealTracks - Preferences - 'speed up generation'. Perhaps you have unchecked that.
No, it's the boot up time, and the same quite complex song file MGU, is what BIAB loads 'automatically'. BTW I have bypassed the the the BIAB folders (marked them as trusted) in my virus scanner BTW.
I'll did some bare bone SGU boot tests just now, just a C chord, and saved the empty SGU (ZZ jazzwalz.sty) created in each of 'em, and restarted both BIAB versions. Biab 2018 520 just over 2 seconds, BIAB 625 x64 about 10 seconds ... Speedup generation is on, but in this one no realtrack except the drums.