Most of the load time issue in the back-end is cause by the time needed to load all categories in the Explorer menu. You can reduce the time needed for this by reducing the number of levels (of categories) the explorer load:

1. Goto Mosets Tree Configuration
2. Click on Admin tab
3. Set Explorer's Tree Level: to 1

The above setting will only load 1 level of categories in your Explorer, reducing the time needed to load Mosets Tree's back-end pages.