instead of: RSIPREV=iRSI(NULL,0,14,PRICE_CLOSE,0); shouldn't there be: RSIPREV=iRSI(NULL,0,14,PRICE_CLOSE,1); ? anyway, simple rsi is not the answer to successful trading

If someone share any ideas for HFT systems here, I'm sure you will not use it in retail trading

I have read all suggestions... I'm pretty sure you can optimize your code avoiding spending money on new equipment. Faster computer will not solve your problem if you have obvious bottleneck somewhere. First of all you have to find where that ...