Compiling Shaders Question

Hi. I'm very new to RPCS3 and I was just wondering when the games say compiling shaders on the bottom left of the screen if it's normal for the game to stutter/flicker/lag/glitch for a second or two on the game's first play through. It seems if I restart the game and play through the same spot that it plays smooth because the shaders for that area were downloaded. I know emulation is not perfect, especially the more recent generations, so I'm just wondering if this is normal and not something I'm doing wrong.