If it is intraday real time feed, then nothing can be done.
Intraday feed depends on your Broker's server, NSE and your bandwidth. If RTD is missing few ticks, that means you did not receive those ticks to your terminal from NSE/Broker's server.
There are Members using Esignal and GDFL for perfect data feed. However, both sources are very costly and there are complaints regarding data quality of that too. RTD is as fast as any of them.