Like many have been posting, you appear to be fighting high congestion coming across and getting out of California--bolded sections show a wide variance in response times. While a litle variance is normal, what you are seeing there (swings anywhere from +20% to +200% delay) is far beyond the normal. The trick will be convincing Comcast to look into the issues on their last segments before handing off to their routing partners--and then communicating effectively with those routing partners to investigate things on their end.
Notice the variance is happening early in your route, and not towards the endpoint when you are hitting SE's servers and their ISP's. Those hops at SE's ISP (Ormuco) are actually showing the normal variance you would expect. The increased ping time isn't that out of whack either, you're talking around 1/7th a second in delay with that response time---not hardly game breaking there, especially considering you are crossing into Canada.
The bigger concern is the wide variances in the delays at the same hops. This signifies a router is either overloaded or approaching an overloaded state, so one of two groups need to step in: the one that is forwarding you to the troubled router, or the ones managing the troubled router. Ultimately, one of two things needs to happen: the congestion is somehow relieved at the sight (this is why ISP's throttle--a byproduct of traffic shaping to control congestion), or you are re-routed to a different router to avoid the congestion.
This is something that will be difficult for you to manage--your ISP and SE will be your best advocates here. The best course of action would be to open a support ticket with both your ISP and SE, including the sample traces. This gives them a roadmap for where you are coming from, going to, how you are getting there--and gives some clues as to where the route is running into issues. They may not be able to act on it right away--but if they get enough reports exhibiting similar signs, it will eventually become actionable and they <should> take action. The trick is getting enough people to report these kinds of findings to them.



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