So far scrolling is a little jumpy, sometimes 2-3 screens on the slightest swipe.
It does not make sense to refresh the package list every time. Example: Going back from "install" to the "main menu" and to "uninstall". -the package list gets refreshed twice. Maybe you could add an option to stop re-checking for 5 minutes after the package list has been updated as well as a force re-check button from the drop-down menu. -I also noticed that the default app manager can usually enter "uninstall" without delay.