On RIMP: Did RIMP stop because of the memory issues or the team issue?
It was a multitude of things but more than anything it was the release of HOI3
I personally was (and am) holding off due to the patches still being a work in progress... and with a new expansion suddenly in the realm of possibility... well a lot of work has been wasted in the past when new versions of the game changed everything.
Do you know whether the memory issue was the game slowing down or the map not compiling?
Both actually. It will slow down (especially when you add new countries) to a point and then it will stop compiling all together.
Based on the fact the some people seem to hit this wall sooner than others (and need to download pre-generated textures separately) suggests that it is system dependent.