We did some analysis on High Frequency Data (not available for retail traders) where data comes in every 2-3 microseconds (1 millionth of a second).
Just to give some perspective
- Each day close to 1 TB of data is generated by the exchange
- Data is disseminated across almost 30 IP addresses
- The total bandwidth required is 10GBps (normal house internet is max about 300 mbps - some have 1 Gbps)
So what can we say about intraday trading ?
Profitable trades occur only in 20% of market time. So in essence - if your in market time where your positions are generating PNL is more than 20% of your investment horizon, you need to relook at your strategy
Roughly direction of market is determined in time steps of 120 microseconds - so for a trend to develop - it takes within a second - whereas market data comes in 1 second intervals for most retail trading platforms
Anyways - it takes years of development and fantastic technology professionals to build a platform that can handle such speeds of data. Hence so rare.