I'll preface this by saying it's not playback lag, on the contrary, it runs pretty well despite my spec being on the entry-level of things. Anyhow, the problem lies in navigating the timeline as I use the hand tool on it there's some significant lag like you'd see in 15FPS games. Here are the specs of my laptop:
GPU - RX 560X (4GB VRAM)
CPU - Ryzen 5 3550H (Boost clock 3.7)
RAM - 32GB
Storage - Samsung 970 EVO Plus 1TB
Those are the basic information, but if further detail is needed such as driver version, or RAM speed, I'll provide them.
Not experienced this sort of lag myself, but when AE does start playing up, first thing I do is clear the cache. The second thing is check that there's no competing programs using up resources. When it's happened to me in the past, it is because my anti-virus software is running a scheduled scan.
If you have a lot of properties and keyframes open, try to close soem of those. AE is terrible at drawing lots of such interface items. Also if you use time-remapping and expressions consider hiding/ turning those off as well. Sometimes AE flaseley re-evaluates such stuff just scrolling through the timeline or accidentally grabbing a layer when panning with the hand tool.
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