I have a lot of 301 redirects (1800 already), and I guess that they create the problem for my site. Can you point me to any documentation about the 301 redirects, or how to get rid of them for the future ? i understand from another post here that i can delete them but as i understand they were created automatically and i want to turn it off.

Hello,

The 301 redirects are automatically created only when you manually change some of the SEF URLs, so that the old url is redirected to the new one correctly. You can turn this feature off by setting JoomSEF Configuration, Advanced page, "Ask before saving URL to Moved Permanently table" option to "Yes". Or you can turn off the 301 redirects entirely by setting JoomSEF Configuration, Advanced page, "Use Moved Permanently redirection table" option to "No".

Best regards,
ARTIO Support Team