I think I may have found a bug...

When I use the dictionary from the ereader side it works fine and is quite responsive.

When I open the dictionary app on the LCD is works fine also.

But, if I have opened the dictionary app on the LCD, and then use it from the ereader, (or vice versa), it is painfully slow responding... meaning it takes a long time to open on the LCD side. Because there is no way to close the app on the LCD side, the only way to solve the issue is to shut the EE down and restart.