For the most recent Disneyland races I had a really long wait, I think I just barely made the cutoff time for being sold out. Today I was able to get the 5k and 10k right away, and those were the only races I was going to sign up for. I had-
iPad 1 safari: 5 minutes
iPad 1 chrome incognito mode: over an hour
iPad 2: over an hour
phone: over an hour
I logged into safari, iPad 2, and my phone about 15 minutes ahead of time, and the incognito tab right at registration open. I did refrest iPad 2 towards registration open as I remembered people mentioned last time I registered that it might have helped them get into an earlier queue. None of the other wait times came down after registration, and it took me about 6 minutes or so to register for both races.