[esailija]

> If you are using a language where the standard libraries are so poorly implemented that you can easily write better versions, you might want to consider using a different language.

Standard libraries are typically generalized for a wide array of use cases, you can easily write much faster implementation specialized to your needs if you have any idea what you are doing.

Sometimes standard libraries handle such ridiculous cases (e.g. many ES5 array methods and Function.prototype.bind) that your needs don't even need to be that special.