I've been having the same issue since the Season 10 started. I tried the graphics card driver update and the disable and re-enable shader cache. It speeded up the loading process, but I got major frame freezes during the entire game, in multiple servers and graphics set to minimum.
I followed this suggestion to completely remove the graphics card driver and re-installed GeForce Experience and the driver:
https://answers.ea.com/t5/Technical-Issues/Important-Nvidia-Update-419-35-The-HUNG-Fix/td-p/7631857
I not only have the same frame freezes but also got the "Loading and compiling shaders" message again every time I start the game. What's bothering me the most is the frame freeze, it's becoming impossible to play the game, especially because it gets worse in combat. This is one of the recordings I made of the issue:
https://youtu.be/lmdfDfkyUTA