Just updated to v8.6.4 from v8.6.1. I use a trackpad 2 and loved being able to two finger drag to scroll through the timeline. Noticing in this version it is no longer a smooth left to right scroll. It is slow and chopping. Tried disabling fast user scrubbing in the timeline setting without effect. Is this a new issue with this version or a setting conflict perhaps? It is a pretty bad bug as it has gone from taking me seconds to check a timeline in this way to several minutes.
Mac Pro, 12 Core Intel, 64g ram, os x 10.11.6, Avid MC v8.6.4