How often is the speed of a program measured, and how is it done in Java?

Question

Java

if you think you want to use a LinkedList, measure the performance of your application with both LinkedList and ArrayList before making your choice; ArrayList is usually faster.

This is a quote from the oracle documentation. Should programmers measure the speed of each method? If not, under what circumstances do they do it and how do they do it?

Answer 1

As long as the speed of work suits, nothing needs to be measured.
Then the question arises "is it possible faster" - then the profiler (for example, this one ) is in hand and "alga".