After loading the save game and, in turn, zooming in on each visible city while panning around in a 360 degree arc, then ending the game turn, the game grinds to a near stand still. In the options screen, reachable by pressing escape, the game runs fine, however returning to the main menu resumes the sluggishness.
Let me know If any of the user's custom unit/ or unit/icons files are needed; heres the .dmp, .err, and saved game: ClimbingEast-BugReport.zip