Great nearly exactly what I was searching for ...nearly:
As the search result pages are already full of text, I would prefer if the ranks were displayed using an image, like the Google toolbar which shows a green progress meter.
Don't think it will make a big difference for loading. Now the ranks appear a bit after the page load anyway, at least for me it does.

Thank you, this is the only script I found that does the job and it works! =)