If you are having problems with HG:L running slow or with a mixture of DX10/DX9 settings in the video options in-game after installing the patch. Please check this first.
Exit HG:L.
Start the new launcher... but do not click Unleash Hell.
In the launcher select Options > Program Settings > Force DX9 or DX10 as you prefer > OK.
Click Unleash Hell... enjoy.....
Hope this helps....
[attachment=0:h103qa99]launcher info.jpg[/attachment:h103qa99]