Slow speed on OpenVPN over SSH in android

[Apo1366 0]

I experience slow speed on OpenVPN over SSH in android but speed in windows with AirVPN client is a lot higher 
it seems somehow i get speed throttle
 

[SurprisedItWorks 48]

Modern computers generally have so-called AES-NI encryption/decryption instructions available at the hardware level, so these operations, used by OpenVPN when using the AES ciphers, are very fast on those machines.  Android phones often do not have these instructions available in hardware, and executing the software equivalent is slow.  Try the CHACHA20-POLY1305 cipher in Android to speed things up, as that cipher is much more efficient when the AES-NI instructions are lacking, and there is no loss of security.  (In fact, that cipher is always used by Wireguard.)

The above is essentially an OpenVPN comment.  SSH is another matter.  It is inherently pretty slow.  And it operates over a TCP connection, which requires packet-by-packet acks from the receiving end, which really slows things down.  You use SSH when you truly need the obscurity it offers, not for speed.

Note that none of this has anything to do with AirVPN and how its systems operate.  These are matters of the underlying protocols and would be the same with any provider.