I think we've determined in the past that PREs just aren't the same for everyone.
This is partially because not all scripts account for response times and code execution time in their delays. HF can be set to a 1s delay, but depending on the response time (greatly affected by how many hits per search) and computer speed to execute the code, it can add an additional 1.5s.
10 HITs +278ms
25 HITs +447ms
100 HITs +708ms
And this is not including TO 1 or TO 2, which that response time will be affected by how many requester ids are being requested, or even none if they were all cached.
So everything being equal, someone scanning 10 HITs gets a request off ever 1.2s while someone scanning 100 HITs gets a request every 1.7s, so in 1 minute the 10 HITs person is doing 50 page requests, while the 100 HIT person is doing 33.3 requests in that same time frame.