complex compositions significantly slow the comp/timeline panel responsiveness down, especially on Windows
As recorded here:
..when working with even semi-complex compositions with many layers, the composition panel becomes quite sluggish and slow to respond. Curiously, this is especially bad on Windows even if you throw very high end hardware at it. OSX does get slower in the same type of projects, but isn't nearly as bad. Experienced on multiple machines, over multiple versions of Windows, this is something that's been an issue for years, if not has always been there.
No system resources are being maxed out here. It would go a long ways for UX if you could at least get the GUI working smoothly and responsively on projects that aren't small/simple. AE would start to "feel" faster and snappier and more robust, instead of feeling like it's lagging and hanging up on just on the interface while nothing else is processing.