I had an old alienware machine that I loved, it came with, 9GB RAM which I quickly upgraded to 18, back when PC's shipped with 4 on high end devices. When I got into statistical analysis, I was shocked to discover that some of the programs and workbooks I was creating in programs like SAS, Excel and Access would take literally hours to calculate or compute data... the obvious answer, more RAM!!!! My MOBO supported 64GB, so it got 64.
The result: None of those programs saw any improvement AND other programs started lagging. The overkill was too much for it and despite having two quad core processors (a big deal at that time), my guess is that approximately 60GB of the RAM was wasted. Why? Because these programs are hardwired to only use a limited amount of RAM (Excel is 2GB, not sure of the others exactly, the forums disagree) and the only thing that speeds things up is on the user end, pacing calculations deliberately via base programming, VBA, etc... as you can guess, both of those things barely improve the speed.
Since most Android games and apps are designed to work on single and dual core devices with .5 to 1GB RAM... having 2 GB on a quad core is definitely overkill (for now) and I imagine it'll be 2-3 years before apps (other than hardcore games) begin to catch up with the need for those specs, and 2-3 years beyond that before a significant number of apps "require" that kind of power. I'm sorry to say this, but I'd guess that if you're experiencing visual lag, that's either software or inefficient processing/process switching, not the power behind it.
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