Retrieving data from the pagefile is usually pretty fast, due to the fact that most of those pagefile data is still cached in RAM: principle of locality! Flushing the pagefile after closing a memory intensive app, yes, I can imagine that slows things down for a moment. I don't know Linux that well, it's very well possible that flushing the pagefile in Linux is deferred (better scheduling).

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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