One of my websites is almost static in content and has a fairly constant stream of visitors, mainly from referring sites and the search engines. In the last months I have played around with some options to increase page load speed. I constantly monitored the page load speed mentioned in Google Webmaster Tools, and at the same time looked at the number of pages per visitor. The sample size of visitors we talk about is about 100,000 unique visitors per month, over a period of five months.
Over these five months I have seen a fairly consistent relation between the two. The faster the page loads, the more pages a visitor wants to view. My figures:
4.7 secs: 1.51 pages per visitor
3.0 secs: 1.56 pages per visitor
2.7 secs: 1.58 pages per visitor
Anyone else with statistics to share?