Something I've read on the internet : some citizen was waiting 20-30 mins of loading on HDD
HDD's don't fulfill Genuine Robert's Vision. His marketing partners don't believe in them either.
Buy an SSD. An Intel one.
Now, the real benefits of SSD's aside, have you looked at what GIC really do with the launcher? Something as simple as processmonitor will give you a bit of an insight. Assets are loaded, looked at for a bit, thrown away, and reloaded. It's deliberately wasting time, CPU and IO's.
That's been going on for a while, and nobody has come up with a realistic explanation of exactly why it happens. Even getting the advertised SSD doesn't seem to help - as the same loading and discarding process happens - as far as I have seen on a rig that has one.
I don't have one here myself to test or screenshot at the moment.