Awesome Danilo. I might try setting something like this up myself. While 2.41s is OK, it's hard to move away from the < 1s load times. Also, GlusterFS isn't really an Amazon service. And while I have no problem using 3rd party products, I'd love to stick within the cloud.
I'll try a few more things next week to see if I can speed up EFS or make EBS more bearable.
Thanks for all your findings. For those who want to try the GlusterFS route, seems like it might be OK.