What do the colors in the timeline render bar in After Effects signfify
All of the information is correct, to be clear:


Green cached on RAM
Blue cached on disk


Pressing 0 on the num pad you will notice that on the blue line frames will render faster then on the none line.
Of course it will skip the green line because this process is called "Preview RAM" and as I have just said Green means written on the RAM.

No any other colours in AE.