What is the program waiting for when the computer resources are not busy?

Question

JavaScript

It often happens that computer programs running under Windows (including server ones) slow down, wait for something, the "wheel" near the mouse pointer is spinning, but the Resource Monitor does not see that any of these same resources are overloaded: Processor, Memory, Disk, Network, Video card - everywhere the load is much less than the maximum. Question: how to find out where is the thin place because of which the user has to wait?

Answer 1

method "one" in this case will not help?
$('#button').one('click', function(){ ... })

Answer 2

or a crutch, on success change #button to some other one and then js will not catch it :)