[mrbabbage]

That turns off the animation but leaves the time delay in place. E.g. if you have a text field selected in the target window, any typing you do won't register until the fade in—fade out animation completes (exact same behavior as with the option disabled, but with the fade animation instead of the slide animation).

[joshspankit]

This.

Apple hard-codes “while lies” to make the experience smoother for those with slower devices, but they end up getting in the way if you want the UI to run fast.

It’s like having triple-buffering and vsync enabled all the time. Less chance of it looking broken, but not worth the tradeoff for those that feed on responsiveness.

[jbverschoor]

The delay is caused by the fact that there’s different behavior between cmd-tab short and longer press.

Sorry will not open the horizontal list of apps.

It’s similar to the delay you have with double tap detection