I see lot of lag during trading hours with the one associated with demat account, the separate paid version performance is little better, I also see sometimes price don't get updated, may lead to take wrong decision in short a lot of performance issue, it lags. The whole purpose of demat along with opstra is lost, its such a pain to see the active position, chart, portfolio, startegy in different windowslotvof discomfort when you need speed frequently I have to refresh to get data updated