This is another one of the controversial questions in many of the SEO (Search Engine Optimization) forums, yet it is very easy to answer for any particular search engine. While popular belief seems to be that pages should be very short (less than 10K) to rank well with the leading search engine, this article conclusively answers that question... with a completely different answer.
The methodology is really quite simple for this question. I gathered the results of the queries I naturally performed last month using the leading search engine and analyzed them. I had to visit each page and write down the size of the page (not counting graphics... just the size of the HTML). Those sizes were then tabulated for the first 10 rankings and converted into a normalized "ranking correlation".
The resulting number shows each group of page sizes normalizing into a number between -100 and +100 showing the likelihood of being ranked higher/lower. A value of +100 shows that all 10 rankings were in the proper order to show that pages of the studied size ALWAYS rank HIGHER than pages of another size. A value of -100 shows that all 10 rankings were in the proper order to show that pages of the studied size ALWAYS rank LOWER than pages of another size. Numbers in between show the varying likelihood of rankings proportionally between -100 and +100.
That is the number you see on the Y-axis. On the X-axis, we have groups of page sizes varying from 0 to >100K bytes. Here is the graph: http://www.SearchEngineGeek.com/graphs/clg02.jpg (Note to webmasters: You have permission to hot-link to the graph, text link to it, or even copy it to your own site)
There is an obvious correlation, which shows that pages of a size between 30K and 60K generally rank much higher than shorter or longer pages. The peak of the graph shows that pages between 50-60K rank the very highest. This goes against the popular belief that states that shorter pages (less than 10K) rank highest. The popular belief is shown to be completely inaccurate with this study.
Notes:
1. For the purposes of this test, the actually page size in bytes was used. The page was saved to disk and then the size of the file as reported by the operating system was used. Graphics and any other external references were completely ignored.
2. Over 1,000 queries and over 10,000 sites were examined for this study.
3. There was no exercise to attempt to isolate different keywords. I merely took a random sampling of the queries I performed during the month.
Conclusion:
Pages of a size between 50K and 60K rank best on the leading search engine!
This is merely a correlation study, so it cannot be determined from this study whether the leading search engine purposefully entertains this factor or not. The actual factors used may be far distant from the factor we studied, but the end result is that this search engine does, in fact, rank pages between 50K and 60K higher than pages of other sizes.