InfoPath Dev

 Thanks for the replay, Shiva.  As I have mentioned, I am sourcing data from webservice for dropdown which also does filtering. But even after filtering there can be situations where WS may return thousands of items to show in dropdown.

Can you give some more info about what error you are getting? Have a look at logs in \12\LOGS. Make sure that form is deployed properly and library settings are set to open form in browser and not in infopath client.  

Hello, I have got, - Web form - cascading drop downs with large drop down lists with up to 10000+ items in parent combobox - Web service as drop down data source. This current setup works well for a small amount of data. As number of item increases, form load becomes very slow and becomes very hard to find values from comboboxes. My ...