Dual Monitor Time Lag

[JimAscher]

I take advantage of the dual monitor option in Lightroom for my editing, with the control panel on one monitor and a full screen (loupe) view on the other.  However, when I make a correction (edit) on the monitor with the control panel, there's a noticeable "lag" of a second or two before the correction appears on the second, loupe-view monitor.  This minor delay is disconcerting, as I don't see the immediate effect, for example, of a change in a slider position.  It really, for me, slows down the process.  Has anyone else noticed this effect when editing in a dual-monitor mode?  By the way, I'm working with Windows 7 at 64-bits.

[Steve Weldon]

This is 'normal' behavior.  In the main window you're actually editing using a preview image, and in the extended window you're viewing a preview image.  When you get done editing (lift off the mouse button) the preview then redraws with the new edits.  So there is a small time lag depending on your system.  Less than a second on mine, but you can see it.

If you use the main window to view editing changes you'll see them happening in real time.

[JimAscher]

This is 'normal' behavior.  In the main window you're actually editing using a preview image, and in the extended window you're viewing a preview image.  When you get done editing (lift off the mouse button) the preview then redraws with the new edits.  So there is a small time lag depending on your system.  Less than a second on mine, but you can see it.

If you use the main window to view editing changes you'll see them happening in real time.

Steve:  Thanks, that clarifies it (but I think possibly you have an inadvertent typographical error -- do both monitors have "preview" images?). 

[Steve Weldon]

Not an error, I just wanted to make sure it was understood that both use preview images (AFAIK) but that only the main window preview image is showing the edits in real time, the other lags a bit as it updates with the new edit information as you let off the mouse to finalize an edit.

The windows use different version of the preview image because the two different windows (monitors) can be set up to show different images, zoom levels, etc, at the same time.  One is not necessarily the mirror of the other.

If anyone has a more technical explanation I'd be interested in hearing it..