Google Webmaster Tools - Crawl stats

I logged into my google webmaster tools and found a nice chart which tracked the time it took to load a page on gosammy.com (my blog)
The arrow points to the time when I moved off media-temple's grid server to a 256mb slicehost vps. At the beginning of May I switched up the server again (still using the same vendor under the mosso brand) but this time used nginx to power the server rather than apache for even more optimization

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