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I have received the controls over a long-established site, who has been made with the french CMS called SPIP. It is quite useful, but I have my doubts on the degree of optimization for Google, as it produces urls with lots of? and .php3 in.
What are the ways to improve its Google ranking (it is full of authentic real content)?
Not ideal, but better than using query strings. If your site is well-established though you should be careful about changing the URL structure - and if you do so you must redirect the old indexed dynamic URLs to the new static-looking ones.
I wouldn't spend too much time worrying about dynamic versus static, just get on with basic SEO. I wasted about six months chasing the supposed SE problems created by dynamic pages, then gave up and simply worked on optimising the site. Now I get first page, above the fold, for most of the pages that matter. Client is happy, traffic just continues to grow.
I wouldn't spend too much time worrying about dynamic versus static, just get on with basic SEO.
I no longer will allow question marks in the url for any page that I want Google tof ind.
Crawling urls with query strings does require some extra processing by the spider, just to be sure it isn't getting into trouble. And I can report that rewriting the urls has always improved indexing whenever I've seen a take that step and do it properly.
But still, they can and do index dynamic urls.