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I believe OP means that if you press Alt+Tab and release the keys quickly, it'll simply swap to the last window without showing ("flashing") any UI overlay at all.

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The Windows one doesn't --- at least on XP, that is; Alt+Tab causes the switch window to show up the instant it's pressed.

The delay may be the reason others here are noticing that it's "slow".

Neither does the switcher on Windows 10.

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