I started out just wanting to turn on wireframe mode, because I can't stand firefox making the windows not responsive whenever resizing.
Run gconf-editor (if not available, yum install gconf-editor)
Browse to /apps/metacity/general/
and create a new boolean type key "reduced_resources", set to true.
Here's the comments that comes with the schema:
If true, metacity will give the user less feedback by using wireframes, avoiding animations, or other means. This is a significant reduction in usability for many users, but may allow legacy applications to continue working, and may also be a useful tradeoff for terminal servers. However, the wireframe feature is disabled when accessibility is on.
As far as I know, it is not possible to just turn on wireframe mode alone, and retain things like animation.
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Chu Jeang Tan