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Thanks for that important bit of information.
I think I've narrowed it down to this kernel wakelock
In betterbatterystats it sits at 79% while the next closest are PowerManagerService.Display and PowerManagerService.WakeLocks at 17 and 12 percent respectivel...
By far the best fastest browser I have ever used has been Naked Browser. The ui is bare boned and features are lacking but it operated amazingly smooth.
When you get used to it, it's still only like 80% accurate. Randomly it will unlock super fast and other times it fails alot. It's really average.