Hi,
Could you share a little about the setup, are you using a specific theme, or some specific plugins which might be causing CPU load?
The customizer is primarily powered by JavaScript, which is handled in the browser (it does make calls to the backend as well for some things, but not 100% CPU utilization ones).
Also keep in mind that it might be 100% of your allocated CPU time, which on a shared host is most likely quite limited.
i found the problem, actually when try to change site icon the shared host cpu is 100%
As per the guidelines for the Alpha/Beta forums, I’ll be marking this thread as resolved as we haven’t heard back in over a week now.
Should you have more information to share after this though, don’t hesitate to do so, the marking as resolved is just to help us keep sane and keep tabs on threads.