I try primal occasionally and can never switch from Amethyst. I don't understand how a client with a caching server is so much slower to one without. Accessing the comments to a note has a noticeable lag, and I often notice comments on Amethyst that just aren't there on primal.
I also find images hosted on primal load more slowly than images hosted elsewhere FWIW. Maybe I have bad routes to their servers? All I know is it's slow.