For measuring IE10 we updated from urlblast to wptdriver. Unfortunately, wptdriver doesn’t deliver expected results for IE10. The Document Complete event is sometimes triggered too early. The event then is triggered before the first connection is established (see IE10-result below).
IE10 (wrong document complete time): http://www.webpagetest.org/result/140122_9Y_EXG/
FF (expected document complete time): http://www.webpagetest.org/result/140122_6K_GJ4/
The measurement for the onload event is triggered in the wptdriver extension for IE. May there probably be a bug in this extension?