With this update (and the last one), my key commands are failing after about 15~30 minutes of editing (raise, lower, turn, etc.). Even the map display stops allowing me to zoom in and out while in the scenario editor after the same amount of time. Some operations, such as the track selection tool, doesn't quite work as it once did - I need to click just to the left of a piece of track to get the initial yellow box to display before dragging the second along its path.
The biggest issue I'm having (all RW3 versions), however, is that the sim is sucking the life out of my PC. With RS or RW2, I could have Google Earth, Firefox, Photoshop, and Paint Shop Pro all open at once without issue. RW3 by itself makes my PC very sluggish for about 15 minutes or so until the memory has fully cleared - and that's with nothing else running - very annoying!
The sim itself seems to be a bit faster than RW3's initial release, thank you, but still a dog when compared to previous versions (matters not if TSX is switched on or not).