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Currently my sites pages load in about 500ms. The HTML, CSS, JavaScript, PHP, Python, Perl, and SQL queries are totally not optimised. If I recreate the site using Joomla, will my site slow down?

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"Currently my sites pages load in about 500ms." So are you using a CMS at present (Drupal?) or is the content you're talking about just static HTML plus stylesheets, scripts, and multimedia files..? – danlefree Feb 3 '11 at 10:25
I am not using a CMS yet. All my pages a coded via php and generated mostly via several sql queries. – oshirowanen Feb 3 '11 at 10:48
up vote 0 down vote accepted

I don't think there would be a difference in speed.

Some CMS/Frameworks have more streamlined SQL queries, but the speed in which a CMS delivers its pages isn't noticeable. The noticeable advantage of a CMS is the security it provides when querying the database. Things like images and JavaScript files impact on page delivery times more than a CMS.

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One advantage a CMS could offer you is caching - "saving" page HTML for a few minutes, hours, or days so users who aren't logged in get these saved pages, instead of pages that execute all the database queries every time a page is loaded. In addition to page caching, there are also other mechanisms available for caching parts of pages.

500ms is a very long time for a pageload. I would suggest you find professional help, since it sounds like you are using a lot of different technologies and are in a rather complicated situation.

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Drupal is known for being a little slower than other CMS. But there are some ways to make it faster, it really depends on your configuration. I don´t know Joomla.

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