Altium designer 19 freezing

[Lucky-Luka]

Hi all
I've just started a course using Altium Designer 19. After designing all the components symbols I've designed the first footprint of a capacitor. After I assigned it to the first component and going to assign it to another capacitor symbol, I've noticed that the program became extremely slow, almost blocked. Swapping between symbols in the left SCH library takes minutes... Altium is totally unusable. I've tried to restart the PC but the problem persist. I've tried to reinstall the program but the problem persist. Any guesses? I attach the project I've done so far.
p.s. Win10 64bit, 16GB RAM, geforce gtx 1050 ti
p.p.s. I've installed the program even on another notebook and the situation is the same
p.p.s. I have to admit that the program isn't original

[E-Design]

no problems here. Be sure to use one of the final releases of v19. For example, v19.1.9 is what I use and I experience no slow behavior ever.

[thm_w]

Is the problem only with that project or also present in a blank project?