Your keyboard (if using a PC) has Page Up HOME and Page Down END- functions, located in the lower right corner of the board. This will scroll the page the fastest when held down.
You can always place the cursor/pointer on the small arrows at the top and bottom of the shaded area in the vertical scroll bar, and click to move in either direction, or drag the shaded area itself, with the left tab of the mouse, by clicking and holding it down, using the cursor/pointer. Also, if your mouse has a wheel, then by placing the cursor/pointer anywhere on the open page, you can move what you are viewing, accordingly.
So-
you’ve got the left tab on your mouse to click to move the page, providing the cursor pointer is on the small arrows,
the mouse can be dragged as long as you click the cursor/pointer on the shaded bar at the same time,
the wheel in the mouse can be spun,
the keyboard has the Up and Down function keys,
and there are individual keys with arrows that move the page, albeit slower than the Up and Down keys.
One more function- by placing the cursor/pointer anywhere upon the scroll bar section, the page will move when the mouse is clicked. If the cursor pointer is above the shaded box, the page scrolls up, and if the cursor pointer is below the box, the page scrolls down.
You can set how many posts appear on a page at one time, from 50 to 250. The less a page has posts, the quicker it is to scroll one way or the other, and likewise, a thread with 250 posts, will take more time to scroll.
Hi freepersup, many thanks for these clues, I totally forgot about the Page Up HOME and Page Down END key functions. I use some of the other features.........