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Find out why Opera thrashes?

  • Is there any way to find out why Opera (11.64) will sometimes start thrashing - that is, using essentially all of one CPU core - on particular pages? There should be nothing that causes it to do more than display text and images, since I don't have any video plugins or such installed.

    Here's one instance of a link that shows the problem: http://www.cnn.com/2015/06/08/us/mckinney-texas-pool-video/ When I try to read the story, it works ok for a minute or so (but CPU load spikes on one core), then keyboard & mouse response gets very slow, and Opera eventually crashes.