Websocket Live Data Stream Linked With Own Offline Historical Data

Can live data stream of all the stocks listed on NSE such as Open High Low Close Volume and LTP be passed on to an EXCEL CSV File?

Will there be too much of a lag or latency issue if I run my python code strategy with this live data plus the downloaded historical data i.e BHAVDATA excel csv files of nseindia?

Currently I run these downloaded bhavdata files of nseindia offline post market hours. Now I want to take it online using the websocket API and linking it with my own historical database which I downloaded over the years.

I would really appreciate if someone understood what I'm trying to say.
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