Bandwidth test GRE secret

RouterOS Beginner Basics
1

i’m trying to check the bandwidth from a GRE tunnel with Secret. my Tunnel is between 2 RB750 Gr3 mikrotiks.
my bandwidth without GRE is about :
RX : 550 Mbit
TX : 546 Mbit

bandwidth with only GRE , no secret :
RX : 198Mbit
TX : 192.90 Mbit

and with GRE tunnel and secret :
RX : 70.80 Mbit
TX : 62.60 Mbit

Now my question is if these are the speeds that kinda look normal? because a RB750 GR3 has hardware acceleration but still i lose like 70% bandwidth with a ipsec secret?

2

Its the encryption that is slowing the 750 down.

The 750 Gr 3 has hardware encryption for ipsec but only in a few combinations, AES-CBC and sha1/sha256.

Any other combinations will use software encryption

3

i’m using the ipsec secret at a GRE tunnel , it’s encrypted with sha1/aes128cbc

so it should be hardware encrypted? but still losing alot of bandwidth?