Earlier quoted context omitted.
I demand a benchmark. Saying that something is just false without numbers to back it up is not something I have high trust in, and is the start of the gossip that causes internet wars. First back it up with numbers, then we talk.
Fair enough. I'm running less.js from the command line using node.js on my old-ish MacBook pro: A trivial CSS file (foo {a: b}) takes about 0.11s. This is probably mostly time spent spawning Node and loading the JS. The combined CSS for GitHub, about 160K, takes about 1.6s. This is already longer than most HTTP requests. The doubled CSS for GitHub (the same CSS twice in a row), about 316K, takes about 4s. This is qui…
By airing the file out a bit (just adding some double line-breaks), and passing -O2, it goes down to 177ms :)