TDI rsx based - smoothed alerts lines2 nmc.mq4 has already many functions and is from tsd from 2012. Maybe you find similar versions on your harddiscs?
As I use renko charts, a fast (in cpu terms), simple version would be the best.
It's just a rsi with bollinger bands on it, which needs some smoothing and adaptiveness.
I just found on the bad tsd search engine this file, maybe you want to enhance it a little bit with some filtering?

If I deactivate lines on an indicator, does that make it faster or does the indicator just don't show the lines like in the rsx indicator of the second post?