We have have a grid which contains 40 columns, the first 4 of which are frozen. When the grid is loaded with large amount of data the horizontal scroller slows down considerably. We have experienced the following issues:

1. Clicking on the arrow on the extreme right side of the horizontal scroller does not seem to move the columns. It is only after a few clicks that the columns start to move and it again stops abruptly.
2. Clicking on the blank space on the scroller moves the scroller, however the columns are refreshed after a considerable time. 
3. Clicking on the scroller and dragging it to right/left extremes takes a long time for the grid columns to move.

I have attached a sample to illustrate the issue. We are using WebGrid 7.0.7200.304 but it is also occuring with 7.0.7200.306. Is there any way to improve the scrolling performance of the grid when column freezing is used with large data sets?