EA Studio is specially designed to be fast and reliable. It is a result of more than 15 years of study and development of backtesting algorithms. We started working on it in 2001 and copyrighted it in USA in 2006. We are constantly improving it from the start. The core company asset we develop is the backtesting engine. It uses an algorithm that is very different from the one in MetaTrader's Tester.
If you take MetaQuotes, for example, they are developing a trading platform. The brokers pay MetaQuotes for MetaTrader. So it's easy to predict that the MetaQuotes team won't be very focused on the trader's needs and will be more focused on satisfying the brokers' needs.
On the other hand our company is primarily focused on the trader's needs (your needs!). Our backtester is super fast and reliable. Our analysis tools are based on the backtester which makes them very fast as well.
Speaking technically the EA Studio algorithm is optimized to calculate specially designed strategies with a predefined structure and indicators. This structure allows us to save CPU cycles and to do the right calculations at the right moments.