Well Fris, that /%postname%/ and /%category%/%postname%/ performance issue has been fixed for Wordpress 3.3, it looks like Wordpress has finally decided to fix it and postname is now a suggested permalink option.
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Permalink and Performance Issue
So you have seen sites all across the web referencing to SEO Friendly URL structure in WordPress. Mostly those articles either refer to simple %postname% or /%category%/%postname%/. The fact is that up until 3.2.1, these permalink rules could cause serious performance issues if your site has A LOT of pages. Heck this forced @chriscoyier to change his site?s entire permalink structure. Andrew Nacin (@nacin) brought up the point that a lot of users are using these permalink structure, so we should figure out the issue and fix it for good. And lo? and behold this is FIXED! In WordPress 3.3, the core team decided to add Post name as one of the suggested permalink option.
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