Honestly, unity should add a “follow these steps or wrong pixels etc.” warning to the pixel perfect camera
Try these to fix pixel alignment, non pixel perfect feel, 2d pixel jitter etc. issues(works without pixel perfect camera component too)
For the “lag”, it might be your project/code or the side effect of pixel jitter when moving
It is definitely possible to make a smooth pixel perfect camera with high fps, it just needs a bit extra attention.