[andrejguran]

wonder what would happen if they'd add a bigger Redis cache

[Lio]

Well I doubt you could beat Redis for pure performance but bigger Redis cache would likely cost more to run.

So the real question is about cost/performance and picking the one that best fits your use case.

I also wonder how tweaking the backing DB's in memory cache will effect things.

Either way it's great to get this stuff out of the box with Rails and then be able to swap for Redis later if you observe that being a better fit.