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8GB RAM in M3 MacBook Pro Proves the Bottleneck in Real-World Tests
(www.macrumors.com)
This is a most excellent place for technology news and articles.
Anecdotal evidence, but I've seen many old windows laptops with 8GB RAM use around 3-4GB on the desktop with no programs or background apps running.
Yes, 50% allocation is pretty normal and healthy.