I lubed EVERYTHING I could see move. I guess in the center anodized tube there is a worm drive? The open side faces outside so I'm not sure what's in it.After getting lube in that though, the window regained it's speed. Thanks.
I had the same slow problem.
Removed the mechanism, and "washed" out the tube the cabel travels thru with PB blaster. Then shot some lubricant back into the tube.
Works like a champ for over a year now.