My router is RT-AC68P and currently running the stock firmware which has the ability of OpenVPN. If I installed Asuswrt-Merlin, can I expect an improvement in OpenVPN performance and speed?
Yes, my OpenVPN (and OpenSSL) implementations are optimized for performance, while Asus's is optimized for size.
I changed the question, my concern now is setting up OpenVPN similar to the stock setup method?
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