Metrics

This page catalogs full list of metrics supported by Show Slow.

Each section lists metrics reported by particular tool and various variables (e.g. URL parameter names).

Most of this information is replicated in global.php  array and drives graphs and lists of metrics on details page.

Page Speed
Google Page Speed can send data (from export menu) and can be embedded within the apps (e.g. har_to_pagespeed).

Beacon documentation is available on Page Speed's wiki.

YSlow
YSlow's beacon is documented here

Rules list can be seen in source code: rules.js

Overall grade is calculated based on a weight matrix documented on YSlow site.

Some (relatively old) info is also available on our blog here.

ShowSlow uses "grades" type of beacon which sends beacons of intermediate size/detail.

WebPageTest
Metrics are tracked for first and repeat views and are prefixed with 'f_' or 'r_'.

DOM Monster
DOM Monster is a bookmarklet developed by Thomas Fuchs and measures a few browser-centric metrics (vs. network-centric).