I feel cheap but I somehow fixed this by means of TaskBarX
The start button that you guys are inserting is creating lag and latency all over.
I've remember that TaskbarX allowed to insert the start button by means of a shortcut onto the taskbar as a "Windows Button" app call.
The direct link for the icon shortcut is: "C:\Program Files\taskbarx\TaskbarX.exe" -showstartmenu
With this neat trick, I am only using taskbarX to open up YOUR START11 start menu and the latency is gone, because I disabled the option to show the Start button from Start11
Surely If I can make the start button work with this trick and without latency, you can fix the start button latency.