As many of you are no doubt aware, Try Server load has been very high recently  (sometimes taking up to 24 hours to get a full set of results). Bug 772458 has some dependants that will help, but won't make a significant difference in the short term.
In the meantime please can everyone remember to cancel unwanted/busted Try runs, to help the overall wait time.
Builds/tests can be cancelled all at once, or on a per job basis:
Please don't cancel builds/tests on trees other than Try, without checking with #developers first. 
Thank you :-)
 Killing builds on non-Try trees requires clobbering; killing pending tests can result in the wrong test being cancelled, due to coalescing. The recent changes made to TBPL  prevents people from using cancel in these cases, but some people have still been using the buildapi page directly, bypassing these checks (until bug 664858 fixed).