Subjective comparisons, or broad-brushed ones like “X is slower than Y,” simply use too broad and too vague of a brush. A programming language is a tool, and each of them is designed by someone with something-in-particular in mind. Thus, each language champions certain things at the expense of certain others, just as a wrench is not-so-good for driving a nail although it can be done. “Versus” comparisons frankly aren’t worth much in practice.
“Speed,” especially in a modern-day program, has mostly to do with algorithm. Which is why, in the tiny but important book, “The Elements of Programming Style,” we read this maxim:
Don’t “diddle” a program to make it faster: find a better algorithm.”
But “speed” also has to do with how rapidly a particular set of programmers can accomplish the work, reliably and completely, and how well their work-product will integrate with everything else that surrounds it. Which is why, say, if you’re writing a program for the Android, you’re probably gonna do it in Java.