I just read an interesting post about wordpress permalinks:
Many SEO Experts Give Wrong Advice Regarding Wordpress Permalinks. The post describe in details the speed problems which comes in wordpress when the Permalinks are activated.
The main issue is generate by the wordpress architecture. All the maps between the permalink url and the real items are kept in the database. When a webpage is displayed wordpress has to retrieve a number of items from the database equal to the number of internal links displayed in that page.
The solution proposed by the author is to use a permalink structure that does not start with a text based variable. In the same time he blames seo experts for teaching wrong tips and tricks.
Seo experts are seo experts. Usually they will teach you how to do push your pages up in the search engines. Optimizing your blog should be only the second priority. So you have to remember to use all the time some caching mechanism for wordpress, especially when you use permalinks. You can try WP-CACHE or WP Super Cache.
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