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The pruned nodes (in red) represent entire regions of space that the algorithm never examines. The points inside those regions are never checked. Compare the "Nodes Visited" count to the total number of points. The quadtree is doing far less work than a brute-force scan.
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Network egress control — compute isolation means nothing if the sandbox can freely phone home. Options range from disabling networking entirely, to running an allowlist proxy (like Squid) that blocks DNS resolution inside the sandbox and forces all traffic through a domain-level allowlist, to dropping CAP_NET_RAW so the sandbox cannot bypass DNS with raw sockets.
"But there are also places where it makes no sense at all," she says.