In my opinion, the plugin loads quite slowly at the start.
Is this possibly due to “too many” soundbanks or “too many” wavetables in it?
Apparently Vital scans the presets at every start…
Vst 3?
I don’t have a crazy amount of presets (<1000) but mine loads very quick so not sure, coukd be internet? If log in can’t reach server maybe?
around 2,31 sec on my old 2012 mac mini in logic 10.5.1 under mojave
audio unit with tons of presets
imho: fast enough 
Ok, I have temporarily removed all soundbanks from the folder: instead of approx. 5 seconds loading time, it is now only approx. 1.5 seconds.
But there are also 6.5 GB of presets in my folder, including probably quite large wavetables.
So I’ll have to do some serious cleaning out…
could just be some choice files it’s having trouble reading!