I have a workaround to make iClone load faster. Uninstall iClone then immediately reinstall it. Software, patch, bonus packs, etc. Not 3DX It worked twice so far. It went from taking 70 second to being ready to use down to 7 seconds. If you look at the task manager iClone would just not be active 0% CPU for a good 20 seconds to basically almost no resources used. When you click on the splash the spinner runs for a good 10 seconds. Immediate reinstall fixes the lag.
If I may Add to this Issue, I transferred Iclone over to a SSD in hopes that tab surfing to props, or characters, or even files with in these tabs would load faster. Iclone takes forever to load in items in the menus/folders. its literally faster to use Windows explorer and drop stuff in to Iclone then to use Iclone's interface