Startup lag or delay for debug odk collect app

Hey, I am working with a fork of odk collect, when I try to open the app from the home screen launcher, it takes a moment(4 sec?) to open up the mainmenuactivity. first I thought it is something with splash screen time delay to show the splash so I skipped launching splash screen all together to directly open mainmenuactivity but still the lag is there. any idea where might the issue be? or is the same for all debug build apks?