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Low IPSec VPN bandwidth - how to find the cause?

Hi all. I got an IPSec VPN Tunnel between Europe and USA (latency 135 ms). The internet link on the Europe side is 50/50 Mbps, whereas in USA it is 100/100 Mbps. Using iperf I could only measure 10 Mbps throughput in this VPN tunnel. I also lowered the MTU size to 1410 bytes but it didn't help (it didn't get better, nor worse).

Where do I need to take a closer look at, to find out where the issue is?

Many thanks in advance and regards, Flavio.