How to know how fast google crawls my site? Like if a post a new topic on my forum, how do i know how fast google puts that into search engine? Thanks.
You can track googlebot with any sort of website log tools. If it's not fast enough, make a feed/sitemap-style thing that updates google when you have new pages
when you post an article. After that immediately search on google as site:yoursite.com And when it is crawled. Count the no: minutes after the post.