Now that SSD drives are out and getting cheaper and more common, VSL should definitely check them out and should definitely look into adding an option to lower the preload buffer. With other sample playback plugins, SSD has allowed users to go from a buffer setting somewhere in the middle to the lowest available (and I suspect future versions of the plugs may allow setting it even lower).
When the buffer can be reduced, it can save a ton of memory and load times are very very much faster. I'm hoping to get one very soon for various libraries.