Generating big sitemap, using MySQL and PHP -

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i've made simple sitemap.php, generates sitemap.xml, using sitemap.xsl theme - it's populated mysql database.

everything works, have 4,000,000+ products, , takes long time, , lot of memory, generate it.

does have idea, how can make better performance?

sitemap.php: http://pastebin.com/gm3sa4bs

sitemap.xsl: http://pastebin.com/wvuuwt99


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