TorBrowser Aurora build optimized for Windows OS
I just found this project, called PaleMoon [1], and it seems Erin (and/or Mike) might be able to use some build settings [2] for TorBrowser builds for Windows. The PaleMoon project is Firefox re-branded and optimized for Windows OS, in terms of speed, etc.
I have not built my own Firefox from source, since the non-branded Firefox was called IceWeasel. However, when I did compile my own Firefox I would use optimization settings and they really made a big difference in performance.