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https://www.varnish-software.com/blog/doing-right-thing-magento-varnish-cache
Article from Varnish Software about magento plugins, recommends the Phoenix one...
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https://github.com/mageplus/mageplus/wiki
A community owned and driven, enterprise fork of Magento Community Edition (1.7.0)
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http://www.gpmd.co.uk/blog/getting-and-scaling-magento-in-the-cloud/
An article on how to run magento in "the cloud". Includes a split admin / front end severs. Useful.
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https://github.com/madalinoprea/magneto-varnish/
A magento varnish plugin that enables varnish caching on Magento sites.
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http://magebenchmark.sonassi.com/
A site that apparently compares the "speed" of magento hosting providers. Dubious without further research.
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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://www.magentocommerce.com/magento-connect/One+Pica/extension/1279/one-pica-image-cdn
CDN plugin for Magento that supports Rackspace and Amazon AWS CloudFront. Pushes images on demand, claims to be simple to integrate, and is free.
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http://www.magentocommerce.com/magento-connect/PHOENIX/extension/6322/varnish_cache
The Magento plugin / extension recommended by the Varnish publishers, albeit in a blog post in September 2012.
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http://serverfault.com/questions/130185/store-varnish-cache-in-hard-disk
Useful pointers on how to store varnish cache on disk. Very easy, recommends using ext2 and noatime / nodiratime to improve disk throughput. Smart.
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http://leesbian.net/updating-magento-13x-to-php-53-compatibility
A short list of code changes required to make earlier Magento versions PHP 5.3 compatible. Very useful. Untested.
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http://www.yireo.com/software/magento-extensions/newrelic
A Magento extension to integrate with NewRelic's monitoring system. I suppose it's a Magento wrapper for the NewRelic PHP library.