AE extremely slow render/export times

The result may look simple, but the sources certainly are not. Your screenshot only confirms what the preview on the sales page leads to suspect. This is quite a massive project already with several potential culprits that may cause the slow rendering and ultimately also the error such as possibly the motion tile effect being used to create the fake star background and the various displacement effects used to create the chopped-up look of the glitch also not being easy on rendering since most of this stuff will in fact require to be considerably larger than the 4k comp itself as to not produce gaps at the edges. The first thing to do therefore would have to be to dig into the various sub-compositions and see if parameters can be dialled down, layers replaced with smaller versions or even the entire composiotion downsized. since clearly sharing commercial projects would be inappropriate indeed you will have to provide more screenshots and details if you get stuck on specific problems.

Mylenium

As far as rendering times go you just have to get used to it. No offense, but this seems once more a case where you as a newbie seem to have a completely wrong understanding of what AE is for and how it works and in turn have wrong expectations. That and of course even a 10 seconds project can be infinitely complex, requiring many seconds or even hours of rendering per frame. The rest is simple math: Even 5 seconds render time per frame will accumulate to at least an hour of rendering in your example. And clearly there is something heavy going on if one of the effects is throwing a memory error, but since you have not offered any info on the project contents, screenshots or a link to the original download we cannot advise on how to optimiize render speeds and fix these problems.

Mylenium