There is no reason for the delay to be more than 100ms. The 1 sec delay must be due to some extremely inefficient lazy init or a bunch of io happening when you switch between screens
We’re (largely) not running OSes from spinning metal anymore, so even if there were some I/O that needs to happen (there shouldn’t be), a second would be an indication that the app was doing it badly. A modern SSD will read multiple gigabytes in a second, if the reads are sequential and you don’t wait for each one to complete before starting another. Unfortunately, we as a species have not figured out the programming tools necessary to make that natural.
