Oh. That's tough, because the WMT tools tends to show (in my experience) quite varied results. I can be fast one day and the not so fast another day.
However... try this... use your favorite search engine (or hey... try you SECOND favorite... give competition a chance) to find a speed test site that lets you put in lots of websites.
Then select a dozen or so that rank for your headline term and put them through the tool. Then you have a measure based on your own vertical.
Matt Cutts says that in essence, the website speed card has been overplayed by many. A site needs to be quite adrift before it suffers from a speed penalty. I am sure he was not THIS specific in Las Vegas in November, but what I "heard" from him (in a big crowded room with many other people listening) was that only 1 in 100 search queries "drop" a site on the first page of results. Given that there are 10 results on that page, that suggests only 1 in 1000 sites are getting "penalized" for speed issues.