well keep in mind that this is related to your low graphics card.
with low watchdog, it will only slowdown for people with cpu >>>> gpu and if you think about that dolphin is MUCH more dependend to cpu then gpu, this means the gpu must be REALLY weak compared to cpu.
i had to downclock my gpu to lowest stable values (~15% of original speed) and use high res+AA+AF to even verify that this effect exists.
with low watchdog, it will only slowdown for people with cpu >>>> gpu and if you think about that dolphin is MUCH more dependend to cpu then gpu, this means the gpu must be REALLY weak compared to cpu.
i had to downclock my gpu to lowest stable values (~15% of original speed) and use high res+AA+AF to even verify that this effect exists.