Poor Lightroom 4.4 performance when laptop connected to an external monitor

Hello everyone,
I have recently purchased an external monitor JUST to be able to edit my photos at a higher resolution (1920*1080). However, Lightroom performance is extremely bad and the sliders and crop tool are all laggy when I just connect the monitor that I have bought . Doing the same task on my laptop monitor takes much less time and runs perfectly smooth (the resolution of the laptop is 1366*768).
Is this an issue with Lightroom 4.4 or is it my because my laptop is not fast enough?
Here is some more information about my system specs:
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.
My OS is Windows 7 64 bit and the connection to the monitor is via a VGA cable
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.
Please help me if you know how to deal with this because otherwise I have to return the monitor because it's of no use.

The higher resolution is pushing you to the next higher rendering resolution.  If you are in Develop and set zoom position to 1:4 or 1:8 it should speed back up (each level is 4 times as fast as tge previous).

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