Window Swapping - Windows Readjust

When I'm looping through windows on HKN (via toggle) the WoW Client Window basically redoes it's resolution and takes a few seconds to be 'smooth' again. When it goes from large to small or small to large(to be the main screen) the resolution is all weird for a second or 2.

When compared to ISBoxer - the transitions are smooth when I've seen people switching between each window. I thought It might be something with the resolution I'm using with my window sizes but I've changed them multiple times (using different aspect resolutions) and it doesn't seem to matter.

Code:

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<Command MainTopSlaveBottom>    <TargetWin %2%>
        //<SetWinSize 396 216>
        //<SetWinPos 0 865>
        <SetWinRect 0 810 480 270>
    <TargetWin %3%>
        //<SetWinSize 396 216>
        //<SetWinPos 397 865>
        <SetWinRect 480 810 480 270>
    <TargetWin %1%>
        <SetWinRegion None>
        //<SetWinSize 1920 900>
        //<SetWinPos 0 0>
        <SetWinRect 240 0 1440 810>
        //<SetWinSize 1920 864>
    <TargetWin %2%>
        <SetForegroundWin>
        <SetWinRegion none>
            //<UpdateWin>
    <TargetWin %3%>
        <SetForegroundWin>
        <SetWinRegion none>
            //<UpdateWin>
    <TargetWin %1%>
        //<SetWinRegion 0  396 216>
        <SetForegroundWin>

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