Enjoyable subdued track, but groovy too! The mixing is interesting in that the drums seem to be a lot quieter than the piano and other sounds.. in a way, they sound like they are at the level a pad or a secondary instrument would be in most tracks. Sometimes, though, I felt the drums sounded a bit wimpy with this idea. To fix this, you may be able to add a boost between 55-450HZ, as well as give them a bit more definition by boosting them around 5k. As far as your memory issue, I have to say I really don't know what other thing you might be able to change, because with my computer, I have 4 GB and never run into issues with Ableton. When I used Logic I did run into overload issues when I had like 50-60 tracks, but anyway, there may be another work around is all I'm saying.