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ASUS router RT-AC88U will support NordVPN via OpenVPN
VPN speeds will be dependant mainly on routers hardware – the RT-AC88U has a 1.4 GHz (2 cores)
ASUSWRT Stock firmware (default) will support NordVPN but has limited options, depends really what you are using VPN for ?
The RT-AC86U has dual core 1.8 GHz (dual cores) 
In a completely sane world, madness is the only freedom (J.G.Ballard).
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