1kB JavaScript = 1ms parse time

Optimising some JavaScript today (exciting, I know) and going through the Google Page Speed documentation I came across this little snippet:

In our own tests conducted in early 2011, we found that on modern mobile devices, each additional kilobyte of JavaScript adds about 1ms of parse time to the overall page load time. So 100kB of JavaScript included in the initial page load would add 100ms of load time for your users. Because JavaScript must be parsed on every visit to a page, this added load time will be part of every page load, whether loaded from the network, via the browser cache, or in HTML5 offline mode.

— Optimize for mobile: Defer parsing of JavaScript – Google Page Speed