One of my client added a geotargeting code on the homepage of his site, which increased the page weight to 136Ko. The page was ranking for really competitive keywords at that time, been stable in the top 3 ranking sites for more than a year. When it got crawled (after the code implementation), it suddenly dropped to the 2nd page for all the keywords and never recovered so far.
I know that Google couldn't fetch the entire content at that time (i used WMT -> fetch as GoogleBot and got the "page has been truncated" message). It has been fixed immediately of course, now the page is around 50-60Ko and fully crawlable (all the content is indexable, everything is fine)
I'm 100% sure that nothing else that could have caused a ranking drop has been done at that time - our only issue was this page that went over 100ko. I'm wondering if someone ever had a similar experience?