[zottel]

Well, it's the tabs that are the problem here. On restoring a workspace, OW will reload each an every tab of the workspace to show the thumbnail in the tab. When it's done, this results in very speedy tab switches, as nothing has to be loaded at the time you switch to the tab. With that huge workspaces as you describe, this method will not obviously not work well, though.

Might be a good idea to add a preference item to limit the number of tabs that are loaded when switching to workspace.