I have a site to site VPN setup using to instances of Sophos UTM 9. Everything works fine except I find it is a bit slow. Copying from site B NAS to Site A I get just under 1 MB/s usually more in the 700-900 KB/s range which isn't awful but opening directories takes forever -- like if I click on a folder it can take 30 seconds or more before it even opens and then it takes forever to populate. I have decent internet at both ends so I expected better.
I'm using IPsec -- Auto Firewall rules and strick routing on -- I've lowered the policy to AES-128 PFS to see if that would help but no change. Neither Sophos instances show any significant resource spike (CPU is 2-9% and RAM is the mid-60s on one instance and under 50% on the other which is where it typically is).
Are there any typical issues I should be looking at or testing to determine why the VPN has so much lag?
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