Compare something written in mIRC scripting to something written in php, perl, python, tcl, etc (that does the same function) and you will see that mIRC script is FAR slower.
Who gives a monkeys?
mIRC scripting is a language designed to support one application - mIRC. It's not like people are trying to convert mIRC into an operating system or whatever. Why is it that you must over-rate everything on the issue of speed. mIRC scripting works fast enough (bloody fast) for what it was designed for. C++ or Java or VB.NET or Perl or whatever else there is is not going to do the job any better in any practical sense. Whilst it might be possible to have a whack over a benchmark that contradicts this, your eyes won't see it any different.