Hmm - very interesting. So you mean ONLY changing it in the NVCP? Can still have 30fps lock enabled in the MSFS settings?
I had this white spinning circle starting since a couple of Sim Updates ago and it’s still there now BUT only in some areas.
I figured out that it hangs around (sometimes 3-5 mins in UK where I have a ton of added stuff) if the airport I’m loading into is somewhere where I have a lot of add-ons within range (whatever that pre-loading range might be - is a mystery!!??).
If I load to same airport with all those add-ons disabled, no spinning wheel!
In your test are you sure that you always loaded to the same airport for comparison?
FYI, my add-ons add up to much more than your 100gb. More like 270gb WITHOUT my UK stuff. Add another 100+ for those but I had to split what I load into different profiles as I hit another couple of issues.
This thread may be of interest to you 