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The problem with the Ideas renderer is that the openGL one is abusing a certain feature in the wrong way, which kills performance more than you'd guess on certains configurations :P It's not at all related to alpha blending, but on which geometry it's applied.
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alpha blending has always been a compatibility feature rather then an enforced feature in most emulators,and should only be used when there is blending issues, on games where there are none, enabling this setting more often then not causes problems like the one in the ideas render, one of the reasons it is now causing issues is because graphics emulation is more perfected so the setting is no longer needed, tell me, do you see any graphical anomalies with it disabled or missing effects, because i am yet to see any.
and another thing lol noone mentioned it killing performance, the problem mentioned was lines appear when alpha blending is enabled.
in my experience, when the lines come up when such a setting is on, but don't when it isn't.. then this is indeed a good thing.