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http://20bits.com/article/statistical-analysis-and-ab-testing
A good introduction to the statistics math of split testing.
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http://abtester.com/calculator/
Includes the math behind the calculation, and sample PHP code to actually generate the numbers. Very cool.
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http://blog.asmartbear.com/easy-statistics-for-adwords-ab-testing-and-hamsters.html
Simple formula to calculate statistical significance at 95% on AB / split tests. N = total clicks, D = diff between win & lose, if D² > N, it's statistically significant. Example, 14 clicks A, 22 clicks B, N=36, D=22-14=8, 8²=64>36, win. If 2D²>N, 99%.
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http://blog.cfelde.com/2011/05/performance-rackspace-cloud-vs-amazon-web-services/
Interesting article comparing Rackspace and AWS performance when applying high frequency trading strategies against 10 years of archive data. Rackspace io kicks ass, CPU slightly ahead.
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http://cacti.net/
A web based tool to produce graphs based on data stored in RRDTool, usually used as a front end for data collected through systems like nagios.
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http://developer.yahoo.com/performance/rules.html
YSlow rules for optimising web performance from the Yahoo Developer Network. 34 rules that make sites faster. Very useful reading.
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http://developer.yahoo.com/yslow/
YSlow is an extension for Firebug which shows ways to speed up page loads. It's published by Yahoo as part of their developer network.
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http://info.iet.unipi.it/~luigi/dummynet/
Dummnet simulates different network bandwidth rates and latencies by introducing delays or chokes, works on *nix flavours.
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http://just-dnslookup.com/
Check DNS resolution speeds from various places around the world, very useful.
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http://mixpanel.com/
Web action analytics. Tracks events rather than pageviews, so users clicking "Like", etc. All data in real time, detailed analysis, retained >3yrs. Pricing is free up to 25k data points, $150 for 500k, and upwards. Interesting.
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http://mobitest.akamai.com/
Mobile performance testing platform from akamai based on the webpagetest.org infrastructure, free. Useful.
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http://runslikeclockwork.com/pages/monit_aggregator
A free hosted version of the open source monit-aggregator written by Matt Fawcett. Appears to be free with no node restriction.
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http://torbit.com/insight/
A measurement tool to monitor real user's web performance numbers, similar to lognormal / Google Analytics site speed reports. Free basic plan, premium is $500 a month!
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http://www.anandtech.com/show/2738
The mother of all articles on the technology underlying SSD performance. A monster read. Hat tip @vvas.
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http://www.anandtech.com/show/2829
A follow up to the SSD anthology. Good reading.
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http://www.elevatedcode.com/articles/2007/12/05/replication-monitoring-with-monit/
Clever approach to monitoring mysql replication with monit. Ruby script checks replication is running and then touches a file, monit in turn monitors that file's timestamp and if it gets out of date, sends an alert. Sort of like a dead man switch. Clever.
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http://www.fabrizio-branca.de/magento-caching-internals.html
Very detailed article explaining how Magento implements its caching mechanism. It seems to be some custom classes layered on top of Zend's caching framework. Useful read.
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http://www.gidnetwork.com/tools/gzip-test.php
Very handy tool that will tell you if gzip or deflate is enabled on a url or not.
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http://www.guypo.com/business/17-statistics-to-sell-web-performance-optimization/
Really handy post with links to sources of web performance optimisation statistics.
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http://www.intodns.com/
Really detailed tool that diagnoses in great detail each step of the DNS resolution process for a domain. Free and invaluable.
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http://www.maatkit.org/doc/mk-heartbeat.html
Simple script to monitor mysql replication delay. It updates a value on the master every second and checks how far behind the value is on the slave. Simple yet effective.
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http://www.magentocommerce.com/magento-connect/Magento+Core/extension/1359/magento-compiler
A plugin for magento that is meant to boost performance. Free.
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http://www.nbs-system.co.uk/blog-2/magento-optimization-howto-en.html
Very useful article outlining the broad basics of optimising Magento. Includes links to more detailed information and lots of config file examples. Very useful.
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http://www.phpied.com/non-onload-blocking-async-js/
Strategy to load javascript asynchronously without blocking page load. Involves creating an iframe, loading the script in the iframe, then setting the iframe's dom to the parent's dom to allow the script to work normally. Tricky.
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http://www.stevesouders.com/blog/2012/02/10/the-performance-golden-rule/
90% of time is in the front end. Top 10 sites = 74%, top 10k = 92%, top 50k = 87%.
