This weekend (Feb 22-23, 2014) the ECN.MT4 trade server will be updated to the 610 version (ECN.MT4, PRO.ECN.MT4 and PAMM.ECN.MT4 account types).
The equal update of STP.MT4 trade server, made a few days earlier, has resulted in the substantial increase of order execution speed on STP.MT4 and PAMM.STP.MT4 account types.
Once again we pay your attention to the possible changes in expert advisors and indicators operations due to MT4 file structure and data catalogue placement changes. The additional requirement for getting a better execution speed is updating your MetaTrader 4 terminal to build 600 or higher.
You can find more information in the official article from MetaQuotes Software Corp. (the MT4 platform developer).