Hello there
Sometimes the HDD/SSD left storage causes certain "old" programs to be slow responsive. In that case you can try deleting some files that has no use
or use Disk Defragmentation
Ro use a looooot of CPU, have tried upgrading program priority from task manager? sometimes it works.
About loading screens and freezing, how about your internet connection? Happens a lot to me in my house (where my internet connection its bad, High ping, wifi), but in my job where I use ethernet connection never happens.
Sorry for my taco english
Hope something works.
If not I practiced my English