Steps to Reproduce Bug:
1. Download after effects project
2. Please test the project in both 2017 (CC 14) and 2018 (CC 15) and clear the cache right before previewing. Look at the info panel an note preview performance.
I have a previewing performance drop of over 30x going to AE 2018 (CC 15) version compared to AE 2017 (CC 14). This applies to at least two different computers one (W10, 32GB RAM, GeForce GTX 960) the other (W7, 24 BG, GeFroce GTX 1080)
The comp should run at nearly 25-30 fps on my computers, NOT sub 1 fps.
The comp is setup with the expressions made to simulate a slot game, it's very dynamic and I can easily move around and change some simple key frames and their values and they the comp will automatically update the "game".
I need the code for the "game" to reside in the text layer, and that will produce an array (text string) containing position and timeremap data for all other participating "symbol" layers. They, the symbols, in turn parse the text layer array data to extract their individual positions.
At the moment I've moved back to AE 2017 as my livelihood very much depend on this workflow and currently 2018 (CC 15) is completely UNUSABLE, now it literately takes forever to preview anything. I'm very afraid that future versions of After Effects will continue having this poor expressions performance and I don't know any feasible workaround.
Shame less Bump!
Is no one else experience slower Expression performance when parsing layer text data in CC 2018?
I'm seeing sub-1fps playback from your project as well on CC2018, and definitely seems to be tied to the expressions.
(2013 Mac Pro, 64GB RAM, Dual AMD700 Firepro, MacOSX High Sierra)