Not recommended loading a savegame in the background?

I have the subjective impression that sometimes when I load a savegame whith FF running in the background while I browse the internet, it can take exceptionally long, like half an hour or so. Does anybody have experience with this or am I having some bias? So, I wonder if maybe it’s not a good idea loading in the background? Playing mono version with 10 mods installed.

I think there’s a period of time earlier on when you don’t want to click off the window

Yes, this this is also how it seems to me