Top 10 JavaScript Hack for Optimized Performance

Nice article, I especially liked part about HTTP/2 multiplexing, indeed - every web server should make this requirement a MUST HAVE. However I can't agree on your note that :

Using the Switch case over if/else enables developers to shorten execution time

I can't believe in this - at a lower level both code structures should be compiled into some sort of goto conditional jumps. Let's check. I've made a JS benchmark. This is switch block:

var rnd = Math.floor(Math.random() * 5);
switch(rnd) {
  case 1:
    rnd += 1;
    break;
  case 2:
    rnd += 2;
    break;
  default:
    rnd += -1;
}

and this is if/else block :

var rnd = Math.floor(Math.random() * 5);
if (rnd == 1) {
    rnd += 1;
}
else if (rnd == 2) {
    rnd += 2;
}
else {
    rnd += -1;
}

After pasting these blocks into jsbench.me performance comparison suite,- I've got results that switch block is SLOWER by [0% - 2%] on average. Given many unknown factors - how these tests are executed, JS implementation differences between browsers, execution speed measurement errors, biased outcome (maybe after 1000 or more runs performance difference would be 0%) and etc. - it would be rational to neglect these small execution time differences and for practical purposes keep that both should run at the same rate.