What is the difference between demand paging and pre-paging in Windows memory management?

[ProfRon]

You ever wonder why your PC sometimes lags when you open a big app? I mean, Windows doesn't load everything at once. It waits for you to need it. That's demand paging for you. It grabs memory pages only when your program asks for them. Super lazy, right? But it saves space upfront.

Pre-paging flips that script a bit. Windows guesses what you'll want next. It loads those pages early, like prepping snacks before the party starts. I remember tweaking that on my old rig. It smoothed out switches between tasks. No more waiting around like a chump.

The big gap? Demand paging reacts to your moves. Pre-paging predicts them. You get quicker access with pre-paging, but it might hog memory if it guesses wrong. I tried both in settings once. Demand felt thriftier for light stuff. Pre-paging shone during heavy multitasking.

Picture juggling tabs in your browser. Demand paging loads the page as you click. Pre-paging sneaks in the next one quietly. I bet you've felt that zip without knowing why. Windows mixes them to keep things snappy.

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