Hello,
Sorry to hear you are having issues. Its normal if you have to wait few moment, few seconds, for the Start menu to populate itself when you first open the Start menu. Second time open and so on should be faster. But if it blank longer than few second, that might not be normal. Please report back if the issue seem bad. Also please also report on your Windows 10/11 full build number and Start11 version number too. Which Start11 style you have on also might help.
Thanks
Basj,
Stardock Community Assistant.