Windows 10 Anniversay Update kills performance of AddFontResource / RemoveFontResource APIs
In testing out performance issues on LibreOffice Portable, I've determined that Windows 10 anniversary update positively kills font API performance. It's to the point that my old ASUS T100 tablet with a Z3735 cpu running Windows 10 pre-anniversary update launches LibreOffice Portable 5.2.1 from a USB3 drive faster than my Dell i7 desktop running Windows 10 anniversay does from an internal Samsung 840 Pro SSD.
This may or may not be related to MS14-045: https://support.microsoft.com/en-us/kb/2982791