dhtmlxTree/Grid: Client-side column filtering

I followed the example available from the URL scbr.com/docs/products/dhtmlxGri … ntent.html to create a tree grid with client-side column filtering.  The filtering performs satisfactory when there are about 50 records with 9 columns in the grid, however when I increase the record count to 300 with 9 columns I am seeing a significant decrease in performance on the client-side.  Is there anything I can do to increase performance on the client-side besides filtering the data server-side?  I want to avoid re-fetching the data from the server.