The key to running MT4 is the spread provided by the trader.
In particular, the performance of the scalping EA is affected.
Among the current MT4 provider securities companies, USDJPY and EURUSD are cheaper for both ALPARI and OANDA, which are considered to be the two strongest.
OANDA has cheap GBPUSD.
For ALPARI, EURJPY and GBPJPY are cheaper.