Hi and sorry for the delay in response.
The menu is now released to 100% of users, which means it is possible to contact support regarding urgent issues and concerns. I do apologize for the lack of maintenance on this forum. Regarding your concerns regarding loading time. We do see an improvement of performance with the new menu when interacting with it in published sites. Can you please share the URL where you are experiencing this issue and explain a bit more in depth about what is slow so we can look in more detail?
Thank you, and I am making an effort to understand how your comments slipped through the cracks.