Why are Interpreted Languages Slow?

Question

I was reading about the pros and cons of interpreted languages, and one of the most common cons is the slowness, but why are programs in interpreted languages slow?

Answer 1

Read this Pros And Cons Of Interpreted Languages

This is the relevant idea in that post to your problem.

An execution by an interpreter is usually much less efficient then regular program execution. It happens because either every instruction should pass an interpretation at runtime or as in newer implementations, the code has to be compiled to an intermediate representation before every execution.