I did my first ever export to TIFF some moments ago with Windows build 104 (newer ones don't work on my Win7 64-bit for some reason).
Source: 764 frames (31.86 sec) of 4K 2:1 23.98fps
Export: TIFF 2048x1024x48b
With RED Rocket enabled and outputting to a fast NAS over Gigabit LAN, exporting process took 195 seconds. That feels slow to me but I can't be sure without any reference points. Thoughts, anyone?