I have customize plugin for Wordpress Google XML Sitemaps (author Arne Brachhold) in order to put in sitemap.xml all localized links to posts, my multilingual blog based on Polyglot plugin (author Martin Chlupac).
In order to improve site performance I implement Cache module for my shop, which based on prestashop.
Cache module based on Pear:Cache_Lite engine and able to store cached part of pages to file system.
My estimation in such performance improvement – 2-8 times, depends of you site and database.
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