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A router does three jobs simultaneously: it moves traffic between your network and the line, it runs a firewall and the services behind it, and it operates one or more radios. Disappointing performance usually traces to whichever of the three is under most pressure, and they are not all improved by the same purchase.
Device count matters as much as floor area. A current household runs phones, televisions, consoles, laptops, cameras and a growing pile of small smart-home gadgets, and inexpensive units run out of processor and memory long before they run out of wireless bandwidth.