Did you try it on wifi on your phone? Is it the internet connection or? Because if your PS5 is on ethernet, and you have at least 60 mbps, it works pretty well. Also portal works way better than the phone does. It has basically no input delay like the phone, and it sacrificed graphic quality first

I did try it on wifi but I don't think my wifi is the best for remote play cause it is 45 mbps upload I used to have ethernet but I switched rooms with my sister so I don't have a way to access it anymore I do hear the portal does stream better than phone but not sure want to drop the money on it