They never actually say that the peering agreement results in 2x faster performance, just that they use SPDY for 2x speed (which is something they've been doing

They never actually say that the peering agreement results in 2x faster performance, just that they use SPDY for 2x speed (which is something they've been doing for a while now). >2x Web Performance Speed - CloudFlare uses advanced caching and the SPDY protocol to double web content transfer speeds, making web content transfer times significantly faster.