Option to turn off material library thumbnails
When loading up a material library with only a few complex materials each containing a few unique, high-res maps each, the material editor can become responsive for large amounts of time (sometimes over an hour). This is because Max is trying to generate previews for each material in the library.
An option to turn off the thumbnails on or before loading of the library in question will be a big help. Some of my material libraries are now un-useable because I just can't load them.
*unresponsive for large amounts of time.