I get way more with VTI (high cpu usage) and i get way more with GRE without IPSEC (low cpu usage)
With gre+ipsec or with normal ipsec and no vti/gre I get 26mbps
Doesn't make any sense.
I kind of gave up on it and just assumed it doesn't offload anything when ipsec is enabled. I can deal with the speeds with VTI (100mbps+)