Generally the OS will kick a lot of those pages into swap if they aren't looked at very often in order to free up memory for other things, like cache or other applications. Putting those unused tabs in swap means it can make the system react quicker to what you are currently doing...Just seems strange that 75 pages can’t run without memory swap on the air…
75 is excessive, but each to their own, the 20 or so I generally keep open are probably more than some people would want to see...