large hst configurations break projects interface

In a project with a channel that has a large hst:workspace, there is an issue with adding a channel to a Project.

While the system is copying the hst:configuration node, the system is unresponsive and even goes OOM.

Of course, hst:workspaces should not be so big. The implementation has created far too many prototype page instances (~400). There is refactoring work underway to migrate these to wildcard-driven template pages.

However, there could be legitimately large hst:workspaces that are used with the Projects feature. It could be expected that it takes a long time to add such a Channel to a Project, but the system should remain responsive. Perhaps some throttling and/or paging through the nodes as they are copied will prevent these actions from bringing the system down.