Slower site on bigger server

So I have cloned a WP site from a CPX21 in Nuremberg to a brand new CPX52 in Helsinki (NBG does not allow new servers). I am using Gridpane to provision and manage my servers. A website clone to another server is an exact copy.

The wp admin on the 12 core / 24 GB loads 5 SECONDS slower than on the 3 core / 4 GB CPX21.

Can any one explain? I have tested with top, there is 0% steal. TTFB via terminal is the same for both locations. Downloading a 1GB file from both locations is equally fast. Yet the wp admin from Helsinki is painfully slow.