$100 best router for 500Mbps download?

I dunno about all that - with ext4, maybe, but not with squashfs unless you've also mounted a USB drive and are doing a lot of writes. If you're using it as a router, power loss is a non-issue.

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Alternatively you could try a second hand ipq806x device (e.g. TP-Link C2600, I got mine for 20 euros at the time). It should be able to hit that 500mbps (perhaps with flow offloading or packet steering on). Otherwise you can also try a NSS build for gigabit down: