I think the default for most mouse wheels is about 3 lines of vertical movement at a time.
When you need to jump down 3 pages to the comments, or to a deeper page in a document, most people don't wheel down 3 lines at a time, they grab the scroll bar and zip to the bottom of the page.
When you need to jump down 3 pages to the comments, or to a deeper page in a document, most people don't wheel down 3 lines at a time, they grab the scroll bar and zip to the bottom of the page.