Hi Jason,
Method will only need to generate a screen upon sign in if
1) You left the screen designer open to the screen when you signed out of Method or closed the tab / window
2) You selected Save & Close from the screen in the screen designer, but selected Cancel when you were prompted if you would like to publish the screen
The screen generation will also only take place on the first sign in after the above 2 scenarios take place. Generation of the screens will not take place on subsequent sign-ins.
In Method New (M:N), you will not see this generating screens message at all. We’ve made significant improvements when it comes to saving or “publishing” screens. This process is much quicker in M:N and will not be done upon sign in. I hope this helps.
-Audisho