As a side note, if you're not using things in your Environments tab, your pc is still loading them when you start up IV. There's an Add-Ins manager (You can find it in Tools/Options/Add-Ins, or Environments/Add-ins) that will let you turn them off. I barely use any add-ins. Assembly Bonus Tools, drag & drop Interoperability, iCopy, and iLogic are the only ones I have Automatic/Loaded. I use the Content Center every so often, but you can load it from the Add-In Manager when you need to use it.
IV's launch time should improve. & if not? The useless menus will at least be bare.