Hardware Acceleration.
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tweak last edited bySince that is the default setting it seems likely it defaults to it with every update/install. I was curious about why you chose to turn it off? I have tried so many browsers and Opera is my favorite except for the lag I see playing YouTube videos. Sick of the stuttering that NONE of the other browsers ever show as a problem. Hoped maybe your post related to that as I had seen mention of Hardware Accel but so far nothing has helped. 
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browzer1 last edited byI'm running Windows 7. Opera seems more "stable" with HA off on my system. I've had a few instances in the past with the system freezing. Yes I realize that there could be many different reasons. But Opera, for me, works just as well with the option off.