getcooking - 2:32 pm on Nov 20, 2013 (gmt 0)
We haven't had any issues with response time. And the DNS errors we got said that basically Google couldn't look up our domain, which I don't really see being related to page response time (and we have other sites on those servers, none of which experienced the issue).
Maybe response time from the nameservers themselves could be at fault - but our webhost looked into that and they couldn't find anything nor had any other of their customers had any issues (and our other sites use those same nameservers too).
The DNS errors we had were limited to Nov 14 - which seems to be the last day a lot of the data in GWT was updated for this site. I'm still only seeing the structured data as being last detected on the 14th and the indexed pages count in our sitemaps haven't been updated either. Crawl data has been updated as has search queries though.