Question in title…
This is one of life’s eternal mysteries.
I think I can explain what they mean by that (although it’s completely inappropriate and confusing IMO anyway - just say Loading Morphs… and that should be enough).
One time operation is for the duration of the session (until CC is closed and reopened). So it does not load morphs for each character you load.
But until recently it was still buggy as the first CC3+ character (after opening CC fresh) was loading 3-4 times longer that any consecutive and it mainly stuck on updating morphs message.
It’s still an issue with CC1 base (although no one use it anymore probably). Like if you open CC and try to load CC1 base, it takes about 3 minutes on my computer. Any consecutive CC1 base loads in 15-20 seconds.
This has IIRC not been with CC432. I reported this here
it was even “assigned” but nothing happened so far referring to the FTracker.
There seem to be another annoying behave, when i load a char CC very often sais “updating morphs” which take minutes sometimes to perform a load.