Hi, please, can you tell me if spread is always the same during a backtest or if it changes like in real ? in memory with archived data?
A standard MetaTrader installation uses simulated tick data at fixed spread, but that spread is selected by the user for each run.
You can however use 3rd Party tools in order to use Real Tick data as well as achieve Real Spread and Simulated Slippage.
Use Google and search for Dukascopy tick data, TickStory and Birt's Tick Data Suite.
Thanks a lot, have a great journey.