Using Mirror Displays

[karohan]

I have a mid-2010 Macbook Pro with the Nvidia 330m. Does using Mirror Displays require any less system resources (such as VRAM) than Dual Displays? I mean it shouldn't right (assuming that you use the same resolution for Mirror and Dual) because there is still content on both screens being written to the VRAM?

 

[mulo]

using mirrored displays will use roughly half the vram as not using mirrored.

 

[karohan]

Oh really? So using dual displays should be slower than mirror displays? Because I've noticed that using dual displays will have an initial choppiness with using expose/scrolling/etc. and then after a few times of doing Expose or whatever, it'll be get smooth. Of course, as soon as I do something else, and call on Expose again, it'll be jerky at first again.

Mirrored displays doesn't experience this, it's always smooth just like if I was using the laptop monitor and no external. So I thought something was up.