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Static URLs:
- Encourage people to link to you.
We pretty much know that people are less likely to link to a dynamic page by a wide margin. No one trusts dynamic urls to remain the same (the url is ui).
- Allow proxy caches to cache you.
Many proxies will not cache dynamic urls. Thus, you reduce bandwidth to what is essentially static content anyway.
- Allow browsers to keep static caches.
Same is true for browsers.
- Slows down rogue bots.
If you have any sort of session id in your dynamic strings, you know rogue bots can spend hours upon hours toying with the urls. They can beat your site to death trying to dl it.
I still think that it is wise to switch your dynamic to static any where and every where you can. A static url site will always work better for all concerned than a dynamic url based site - including Google.
We've developed a chaching setup where our thousands of dynamic pages are stored statically until they are updated or the snapshot expires.
This was initially implemented for server overhead reasons.