It looks like that wordpress can’t check for updates on the one server but can on the other. WordPress does not output much information if it can’t, it’s just an request which takes it’s time to time-out.
Install the Disable WordPress Core Update (WordPress Plugin) and the Disable WordPress Plugin Updates (WordPress Plugin) to disable those update checks and see if it helps.
With the Core Control (WordPress Plugin) you can check which transports do work or not. You can even disable updates with that one as well. So it’s probably the only one you need to install.
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