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dhtmlxTree/Grid: Client-side column filtering

I posted the following question about a month ago and have not yet received a response:

I followed the example available from the URL http://scbr.com/docs/products/dhtmlxGrid/samples/grid_complexheader_content.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.

The filtering at mentioned sample use common functionality and works not so well for medium and big datasets.
Currently we have some prototypes of fast filtering routines, if you interested please contact at dhtmlx@scand.com - I will send you updated code.