Any% Thief remains the fastest category of Quest for Glory IV.

The new Swamp Miller speed-up glitch brings the time down from ~10 minutes to about ~9 minutes; less than I thought, but you don't spend as much time running across terrain as you would think.

Sub-9 is possible, but a grind would be needed to get there. Unless someone grinds it with me, I'm moving on to pastures new.

This video has commentary added in post-production; viewers who aren't familiar with the route should find it useful.