[CP2K-user] 64 water benchmark slow with multiple nodes

[MD Simulation]

Hello,

I am running the 64 water benchmark and I see a huge slow down when I use more than one node:

1 node, 24 cores, 55s
2 nodes, 48 cores, 700s

I suspect I've done something wrong during compilation. Any ideas what would cause the slow down? 

Thanks 
Stacey