> And it took 4 hours to migrate our custom extensions.
That seems like a very small amount of work; I'm impressed at how smooth a transition that must've been.
I'm also quite surprised that
> we can handle twice more traffic with same infrastructure.
Wow, I didn't think that PHP application code would be such a bottleneck. Maybe it's not that, but if the entire codebase is written in PHP, and you replace it all in one shot, you just get such an improvement. But I thought DBs, etc. would play a bigger role.