For those in London wondering where is best for UK based customers, it seems, for London at least, this <i>could</i> be an improvement over Dublin (where Frankfurt is slower), as Paris is roughly 70 miles closer. Of course, depending on where / when [1] a UK-based data centre is released, I'd imagine that would be faster still.<p>Currently Ireland vs. Frankfurt is (more data needed of course)[2]:<p><pre><code> Europe (Ireland): 25 ms 27 ms 24 ms
Europe (Frankfurt): 39 ms 39 ms 42 ms
</code></pre>
And Frankfurt is about 100 miles further than Dublin.<p>But for a quick test, this looks like a good tool: <a href="http://www.cloudping.info/" rel="nofollow">http://www.cloudping.info/</a><p>Will be interested to test this once released to see UK / Paris vs. Dublin.<p>[1] Article states UK region "due in coming months". No location announced?<p>[2] Hitting ec2.eu-west-1.amazonaws.com vs. ec2.eu-central-1.amazonaws.com.