I'm using BufferView in my grid, but when I have a large list (e.g. 500), some records are not rendered correctly (some with missing images, cell values, etc.) when I scroll back and forth using the scroll bar. The documentation states that there is a default cache size of 20. Increasing this seems to have solved my problem. May I know what the disadvantages are for having a large value like 1000? Can I programmatically clear the cache?