Not sure why you are downvoted, you are right. The initial loading time was there, but then execution was pretty fast. With the amazingly optimized JS engines

Not sure why you are downvoted, you are right. The initial loading time was there, but then execution was pretty fast. With the amazingly optimized JS engines we have now, it's easy to forget how slow things were just 10-15 years ago. (I think Chrome really kicked of the competition there)