The HBO app on my (admittedly low end and not brand new) Roku is laughable. You have to select a program to watch, put down the remote and go grab a snack or something because it takes about a full minute to load the screen with the show details. All that to load some thumbnails. And if you dare accidentally hit a button before it’s fully loaded, it will crash the app half the time, and the whole OS about 1/10 times. Instead of replacing it with something more performant I use it as motivation to not watch TV and go exercise or read a book instead.