Site to Site VPN with two pfSense high latency

mrsunfire

I have two pfSense running 2.4.5-p1 connected with Site to Site OpenVPN pretty straight forward (AES256, SHA512). Both machines have a Connection with at least 50 MBit/s up/down. Everything runs fine but after traffic is routed through the tunnel, the latency goes high (200ms+). WAN connection stays at below 10ms. CPU usage is at 20-30%, RAM is also more than enough.
I don't get it why this happens and what machine is causing this issue.

Any ideas? The log is empty.

mrsunfire

OK I figured out that its because the speed stucks at around 10 MBits. Last week it was 50. What happened here? The connection speed is fine. Only the tunnel is affected. I also tested UDP, same result.

mrsunfire

This is the result uploading data from my pfSense to the other:

Bild Text

The other direction (downloading from the other pfSense) the speed is fine. So it's just that one direction. But why?