We use jQuery functions very often. Now, in terms of performance, I heard that it is generally a bad idea, since on one hand, it is easy to write, understand and maintain, but it is said to be slower than the "ugly" raw JavaScript code.
Does it really matter in terms of performance regarding the end-user-experience whether you use jQuery functions or the original functions?
For example $('#exampleId').hide()
vs document.getElementById('exampleId').style.display='none'
?
If so, is there a special minifier who converts bad performing jQuery notations into faster running ones?
Or are these just micro optimizations which can in most cases totally be ignored?