On the laptop I use for DVDFab (i7,nvidia,Win7), the splash screen pops up in about 4 seconds and the GUI about 11 seconds later, which is slower than previously but still not intolerable. Note that DVDFab does not check registration every time you start it, only periodically. It does reach out to make sure it can find the decryption and CinaviaRemoval HD servers when it starts, but this is not much more than a ping. It also chats with your OS to see what drives are there that it can use, and looks at the GPU specs, etc. The speed with which all this happens depends to a great extent on the hardware, software and network environment in which it operates.
For best results, start Fab with no optical discs loaded and set it to ignore any virtual drives. Make sure that your network settings are enabled for SSL/TLS security and set any firewalls to allow DVDFab through. Occasionally, updates to security software will cause problems, so consider telling everything to ignore DVDFab.