Nift is possibly the world's fastest website generator (evidence). Focus on development rather than waiting for your website to build.
Nift can scale all the way up to handle building websites with millions of pages.
Lua(JIT) and ExprTk embedded
Nift can be compiled with either LuaJIT (default) or Lua along with ExprTk which has a very impressive userbase. LuaJIT is basically the world's fastest interpreted language and ExprTk is basically the world's fastest mathematical expression parser. Nift specific documentation is available for Lua(JIT) and ExprTk.
Nift tracks file dependencies to each page and can build only the web pages that have modified content, while also able to build all pages or a list of specified pages.
Nift compiles into a single executable file.
Intuitive Templating System
Nift may be configured to build using as many threads as you want, including multiples of the number of cores on the machine.