The dashed circle shows the current best distance. As the algorithm finds closer points, the circle shrinks, which causes more subtrees to fail the "could contain a closer point?" test and get pruned. The search usually gets cheaper as it progresses.
However, keep in mind that real-world performance depends on factors like your home's layout, wall materials and interference from other devices. For best results, place your extender about halfway between your router and the area with weak or no Wi-Fi connection. Always check the manufacturer’s specs — some of our top picks clearly list their expected range so you can find one that fits your space.
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