For me the loading to menu is only dependend on one thing (except update days)
Addon objects in Community folder
The speed for loading into menu is same with SATA SSD or NVME SSD,
because its not by mass loading big files, its just reading the definition files for the addon object
and maybe checking for ingame store/content manager updates
1 addon with GB of size → no real time delay
1000 addons with just some MB each → big change, f.e. traffic libraries (FSLTL, AIG, …) where every aircraft+livery combination have their own JSON and XML files = counting every combination as addon
Loading and downloading bigger parts with very long loading time with every start more likely is a broken install with outdated files