Minify JavaScript files
Use a tool such as YUI Compressor to:
- remove unnecessary white spaces
- remove unnecessary line breaks
- remove unnecessary semi-colons
- shorten local variable names
Use a reverse proxy
Reverse proxies (Varnish, Squid or Nginx) are designed to quickly serve content (e.g. HTML pages and images) using as little of the CPU as possible. You can therefore minimize the infrastructure needed by avoiding unnecessarily accessing the application server.