At what margin do huge slippages start in stock futures?

After how much margin will i start seeing huge slippages in futures for stocks ?

Margin doesnt play any role in deciding the slippage.
It’s all depends on demand/supply, which can be verified from market depth.

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so if 50 lots is being traded if i add the if i add the first 5 bid- ask lots, should i assume it has a liquidity of 50 lots?

This post should clarify all your doubts:

Do you know how can I get the historical data of market depth/ buy- ask spread ?

With considerable wealth slippages come free

see here for historical market depth.

Thanks a lot, by any chance do you know if zerodha Provides historical tick data of market depth for 5min timeframe?