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Another twist in the story... I get the full speed when connecting and running a speed test such as https://www.speedtest.net/ (100Mbs) but... when i copy and file (SMB 3.0) or run an iPerf, I get e much slower speed (40Mb).

I tried adding the byte values to the client config but it made no difference. Any ideas guys?

I checked the CPU utilisation and it was only around 12.5% on the individual CPU core.

I reinstalled everything from fresh and am now getting 100% from my connection.

I might have increased the CPU count, when i reinstalled it. I currently have 4 cores. It was possibly at a lower number before.

Thanks for all the help guys

I've managed to get the OpenVPN working with OpnSense but I only get transfer speeds of around 6Mb/s. The CPU in my server is dual Intel(R) Xeon(R) CPU E5-2630 v3 @ 2.40GHz. Ive seen posts stating that the CPU is probably the bottleneck, which as it is an older CPU would make sense. Someone mentioned that OpenVPN uses a single core.

My questions are:

What could I do to speed up the connection? I have considered buying a cheap Intel QuickAssist card to do the encryption/decryption. Any idea what kind of difference this would make? I can buy a card from ebay for $60. Under System>Miscellaneous there is the option for this hardware acceleration. If I can get up to 200Mb of throughput per second I would be very happy.

https://www.mouser.com/datasheet/2/612/quickassist-adapter-8950-brief-345836.pdf

What would be the best way to identify the bottleneck?

I have tried reducing the encryption bits but the connections seem to fail

Many thanks in advance.