In addition to the rewriters explicitly selected, PageSpeed Service provides the following capabilities by default.
To enable the debug facility, append
to your request URL.
PageSpeed Service removes unnecessary tags, duplicate styles, etc. from HTML documents before serving them.
initcwnd (initial value of TCP’s congestion window) is set to 10 for
better utilization of available bandwidth over the network. Most other servers
initcwnd value of 3 by default. See this
for more details.