Recently I bought Path of Inspiration pack, and tried it for the first time yesterday with my Bard 17 Sensate. Shipwrecked Spy (two-man PUG) went without much trouble. My partner was not interested in any other, so I tried to solo Finding the Path on Casual. Once Dream sequence began... HORRIBLE lag. I could not target ANYTHING. All movement was delayed by several seconds. Basically all I could do was play Fascinate and hope my paladin hireling (Tinny Brightblade) kills Fascinated mobs. Which was not good enough. Fail.

Tried again on Normal with full party. Lag was still noticeable, but not nearly as bad. I was able to target mobs, although I don't think a single Charm Monster succeeded -- can Dream creatures be charmed at all? When three bosses appeared, lag decreased enough I could keep marut boss targeted. When we came out of the Dream, no more lag at all.