I had a look at the yui data grid the other day and noticed one of the differences between the yui data grid and the dojox.grid is how they resize columns. Yui datagrid gives each column a unique class name and sets the width of that class to the column width. When the column is resized, only the class width rule is updated, not each element style width. I imagine this could improve performance instead of updating each element style with the new column width.