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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://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://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://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://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://mobitest.akamai.com/
Mobile performance testing platform from akamai based on the webpagetest.org infrastructure, free. Useful.
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http://www.symantec.com/connect/articles/getting-hang-iops
Outstanding article on hard disk performance, IOPS and predicting drive usage, RAID capacity, and so on.
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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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https://www.cloudflare.com/
loudFlare is an automated CDN / content acceleration type service. It acts as a reverse proxy providing some sort of heuristic security scanning, logging of traffic, and an automatically configured CDN. $15 + $5/site/month.
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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://just-dnslookup.com/
Check DNS resolution speeds from various places around the world, very useful.
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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.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://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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https://github.com/mattfawcett/monit-aggregator
Source code of monit-aggregator by Matt Fawcett / runslikeclockwork.com. He offers a free hosted version at that site.
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https://unixbhaskar.wordpress.com/2010/11/12/measure-website-response-time-through-curl/
Handy article on how to get the response times out of curl. The key is the --write-out / -w option.
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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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https://www.linuxquestions.org/questions/linux-enterprise-47/nagios-vs-zabbix-216790/
A great discussion on the comparison between nagios and zabbix and other monitoring platforms. Very useful insights although a few years old.
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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://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://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://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.
