Scheduler performance issues

Hi,

The custom provider takes the data from the database and regardless using the Client WebService binding that creates seriously a speed issue. The scheduler has got a couple of resources on it, however, it doesn't perform as suppose to be. 
The only way to improve the issue is to load the currently visible dates item on it, and whenever the user changes the visible date/dates on the scheduler then the rebind method can operate along the next available start-end date. 
However, I have no idea how to capture the next visible start-end date and I don't think any other option to improve the issue.
Any kinda help is appreciated.