I'm using AE 2015 on Win 7 64 bit, 64GB RAM. When I try to preview the timeline, for example every 5th frame, AE will calculate the preview, correctly making a green tick on every 5th frame, but then when I want to play it back, it will calculate again every 5th frame, generating more frames in-between instead of playing back the preview that's already cached. This seems to happen whether I'm on a green frame or not, though it's intermittent. Could anyone please tell me if there's a way to play back only already-calculated frames without AE calculating more frames, for example, a command that only plays back already generated frames without looking to generate more? If not, how are others dealing with this? Thank you for your help!