Update: okay, it generates simplest site possible with 250 posts in 7 seconds. This is not the worst performance (it's faster than Jekyll), but I won't call this 'incredibly fast'. :\
And why the downvote, by the way? Is pointing out statements, which may not hold any value, wrong? Especially if they do not hold any value?
One could make the argument that Hexo is fast because it's:
- fast to compile: probably faster or equal to industry standard Ruby/Jekyll
- fast to install: npm
- fast to deploy: single command for Heroku / GitHub Pages
- fast to write: Markdown
You're taking the one word "incredibly" and blowing it out of proportion. We're not talking about super computing here, fast is a relative construct.
Jekyll is slow enough to not count something faster than Jekyll 'incredibly fast'. It should be much faster than Jekyll to be at least 'fast'.
For me, fast is that it can regenerate page while I'm switching from editor to browser. This one can not (7 seconds for almost nothing).