Poor Lightroom 4.4 performance when laptop connected to an external monitor

Started Apr 20, 2013 | Discussions thread
OP hstubc New Member • Posts: 19
Re: Poor Lightroom 4.4 performance when laptop connected to an external monitor

Sorry about that. I will provide all the information here.

NewsyL wrote:

It is difficult to comment fully when you give us no details other the software version you are using.

What are the specs of your laptop - RAM, CPU, GPU (AMD, Nvidia, or Intel)?

The Lightroom version is 4.4 and I have a laptop with 8 GB ram, a 2.4 GHz Intel Core i5 CPU, the GPU is Radeon HD 5650.

What OS?

My OS is Windows 7 64 bit

How are you connected to the monitor?  VGA, HDMI?

The connection is via a VGA cable

Are you trying to run the laptop and monitor screen at the same time - i.e. Spanning across the two displays, cloning, extending?  or are you using a single display i.e. the external only?


Good point. I just want to use the external monitor (single display) so I use it as a projector and I do not extend the displays. I just wanted to edit my photos with a higher resolution monitor so that I see the editing flaws in them more easily.

Right off the top I think you could be running into issues between the resolution of the external (1920x1080) and the resolution of the laptop (1368x768) if you are attempting to extend the desktop across the two displays.

As I mentioned, I'm not extending the display so it could something else.

Perhaps related on the resolution issue but also a concern due the following, the laptop likely only has a single LUT (Look Up Table) in the video pipeline.  The LUT is used to store information used to correct the color of the display.  In most laptops the laptop screen, VGA port, and HDMI port share this LUT.  So when running both the laptop and external at the same time there is going to be a problem with either the laptop screen or the monitor screen in terms of color and it will likely be the external that is incorrect unless you took steps to ensure the monitors ICC profile is being used.


The main issue is the processing speed and the huge lag during editing of the photos. I can be okay with the color even if the color is somewhat inaccurate but very slow crop function or exposure change is just intolerable. The interesting point is that lightroom only takes up up to 30% of my maximum CPU potential during hardcore editing and when it lags. So, CPU overload might not be the reason.

Thank you again for your help!

Newsy http://newsy.smugmug.com

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