Insane and unique load times

[Raist]

hmm.... something may be going on with your hardware. Having the system and data drives split might lead to some issues, depends on how physically scattered the sectors are on the drive I suppose. A 5400 RPM drive may be more affected by high fragmentation if it is missing the expected 1/3 stroke when seeking to the new sectors I guess. Have you defragmented the drives lately?

Otherwise, something else could be consuming resources in the background and it is bogging the loading of textures and character data. I've noticed on my laptop when I swap out to desktop and back there is a bit of lag fully loading things back into view (lighting is the last thing that finally pops back in a few seconds late). This goes a way when I run in borderless mode though---but then VSYNCH is ignored and I have weird display issues. Mileage may vary, but you could try running in borderless mode to see if it behaves better with the alt-tabbing part of it. But I'd try going through some basic maintenance items first to see if it helps out--clear temp files, run malware scans, do a good defrag and such to see if the system in general perks up a bit.

Oh yeah.. and if your system has both on-board and dedicated graphics available, make sure it is running on the dedicated graphics. Things may have gotten out of sorts because of a driver update or something (ie: Windows Update). So, it may be worth reviewing the video card setup to make sure it is still set for optimal performance there. Note you may have separate profiles for battery and AC power modes if it is a laptop too, just in case that may becoming into play somehow.