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I think that micro-optimizations are generally not very important, unless you're writing extremely computationally tasking code. Why? Because computers can complete thousands of operations in extremely short times, and most users won't even notice or see the effects of most micro-optimizations.

There are some cases, of course, when software should be optimized. For example, if you have very computationally tasking code that is repeating many times, optimization would probably be a good idea to save energy and (if code is being run client-side) CPU usage.

More reasons:

• As Mark said, code needs to be readable, and optimization usually makes it less so. That can slow down further development on your project.
• Like I said before, users probably won't notice any change and there probably won't be much more computational strain on your backend. Simply put, you're wasting time for no reason that you could be using to develop new features for your product.

I hope this helps!