This issue has been somewhat improved in Lightroom 4.4. There is still work that needs to be done, but it's better than in 4.3.
The public release candidate of 4.4 is available for download here:
http://labs.adobe.com/technologies/li...
Please note that this is not the final version of Lightroom 4.4, it's a release candidate. A "release candidate" label indicates that this update is well tested but would benefit from additional community testing before it is distributed automatically to all...