Not sure if bounce rate is the right metric. You might want to look at "Actions Per Minute" by each user of the website. This metric varies largely by the domain one is in - games, webapp, social network - all have different actions. The other dimension that you will also need to consider is how many requests are made by the client (browser) on behalf of the user. An AJAX / Long Polling / Asynchronous Request based app might be going a lot more requests on behalf of the user even without any user interaction. Assuming each scroll makes a call to the webservice and considering that the scroll might happen every 30 secs to 1 minute, you are looking a 2 reqs per user per min. If you already have a website doing something similar, that would be a great metric to follow. For instance, in one of our apps, with 1000 people online on a website, but few playing games, others just browsing, the requests we saw were just a fraction - ~5 - 10 reqs per second. But again, your mileage may vary.