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At first I thought it was just lag. It's a horrible default setting in my opinion, since when I hold alt+tab, I don't expect to have to wait. As default, it seems to make my experience less smooth.

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why don't you just change it? it's a defualt value anyway like the size of the icons, the size of the windows, the volume being muted whne freshly installed..etc, something like 1.000 it's pretty responsive – Uri Herrera May 19 '11 at 9:43
Thanks for the tip! I thought it was just my setup! I've made a Q+A so people can adjust this setting at least: – Jorge Castro May 19 '11 at 15:12
Yeah, I realized we can change the default setting, but it makes it slightly more annoying to use and can be misinterpreted as 'lag'. A better default setting would be like 0.1, or something. That small of a difference matters in terms of usability. – Lewis C May 21 '11 at 9:23

When quickly switching between two applications, you don't necessarily want to see a popup. That is what the 0.2s is for. You can decrease the actual window switch delay by changing the speed from 4 to ~1. This is probably the setting you are looking for - I don't see any reason for delaying the pop-up.

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