For the casual player who just wants the story, this is the best official route. For the enthusiast who wants 60 FPS with no lag, stick to RPCS3.

This is likely due to Shader Caching . As you encounter new effects, enemies, and areas, the emulator builds a cache. Stuttering will decrease drastically once shaders are compiled. Turn on Async Shader Compilation in the GPU settings to mitigate this.