JavaScript Startup Performance

Addy Osmani:

Smaller JavaScript bundles generally do result in a faster load time (regardless of our browser, device & network connection) but 200KB of our JS !== 200KB of someone else's and can have wildly different parse and compile numbers.

Using file size as a metric isn't an awful crime, because it does matter, but it's only part of the JavaScript performance story.

It's an interesting read overall, worth checking out if you use JavaScript

Source: medium