TP-Link Archer C7 v5 slow WAN speed

Depending on what features you need a number of MT7621 devices have been enabled for 2Gbps hw accelerated routing.

You could, for example, buy a ZyXEL WSM20 (aka Multy M1) from Ebuyer for £33, or a 3 pack for £90. This would absolutely not be able to do gigabit SQM or VPN, but should do basic gigabit routing with the enhanced device tree on master.

It’s really about working out what best fits your needs and budget.