Tips for PHP
PHP takes a long time to exit
When using php as a CGI extension in Apache (e.g. calling php-cgi.exe via the Action application/x-httpd-php statement) PHP sometimes takes 5-6 seconds or more to exit. The content might show up immediately but the browser keeps loading the page.
The solution I found was to install PHP as a module for Apache instead. Simply re-run the PHP installation file and under Web Server Setup, select e.g. Apache 2.2.x