A client's 2015 installation all take forever to save. This only happens with some drawings and all of them are < 4MB.
The systems are 2013 or newer Windows 7 64-bit, i7's, 12GB+ of RAM, spinning HDD and 1GB+ NVidea cards.
I watched CAD with process monitor and when the systems with 2015 go to save they seem to write to temp\undo.ac$ for 60 - 180 seconds and leave CAD unresponsive until they're done writing whatever it is they need to write. I tried disabling undo (not that I would want to keep it that way :-) with no luck.
?!?!?!