Navigation trees do not need to be reloaded every time you click on a new resource, element or file to edit. Those trees should only be reloaded when absolutely necessary or there should at least be an option to completely disable automatic tree refreshing, in other words a system setting that changes tree refreshes from automatic to manual.
What should happen when you click on an item of the tree is that only the right side of the manager should be reloaded with the new resource, element or file interface. This would be much faster than reloading the entire page and rebuilding the tree etc, without any reason for it.
I know that this would significantly increase the speed of page editing. Slow downs on editing a couple of pages is inconvenient, slow downs on editing 20 or 30 pages is unbearable.
Not sure if there is a modification request already for this, but this should be a high priority change as it will significantly impact the performance of the manager interface.
I am using MODx Revolution 2.0.4-pl2 on Firefox 4.0 Beta 7
After searching the bugs website, I believe that there is a bugfix request that corresponds to what I have described above it is located here -
http://bugs.modx.com/issues/2510
I put my vote for upping the priority of this bug fix