Technical team had a look at my server, they did some changed behind the scene, the speed did improve a bit but is sadly still far away from what I got with my other server in Nürnberg. But atleast some improvement 
Beiträge von Twist123
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I´ve called support and they promised to forward it to the technical team. Lets hope it gets sorted out soon,
iperf3 Network Speed Tests (IPv4):
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Provider | Location (Link) | Send Speed | Recv Speed | Ping
----- | ----- | ---- | ---- | ----
Clouvider | London, UK (10G) | 2.60 Gbits/sec | 18.6 Mbits/sec | 31.7 ms
Eranium | Amsterdam, NL (100G) | 2.57 Gbits/sec | 1.45 Gbits/sec | 25.9 ms
Uztelecom | Tashkent, UZ (10G) | 1.42 Gbits/sec | 2.90 Mbits/sec | 88.5 ms
Leaseweb | Singapore, SG (10G) | 2.12 Gbits/sec | 2.24 Mbits/sec | 185 ms
Clouvider | Los Angeles, CA, US (10G) | 838 Mbits/sec | 2.61 Mbits/sec | 166 ms
Leaseweb | NYC, NY, US (10G) | 1.17 Gbits/sec | 3.33 Mbits/sec | 101 ms
Edgoo | Sao Paulo, BR (1G) | 1.44 Gbits/sec | 617 Kbits/sec | 226 ms
iperf3 Network Speed Tests (IPv6):
---------------------------------
Provider | Location (Link) | Send Speed | Recv Speed | Ping
----- | ----- | ---- | ---- | ----
Clouvider | London, UK (10G) | 2.67 Gbits/sec | 12.4 Mbits/sec | 31.9 ms
Eranium | Amsterdam, NL (100G) | 2.57 Gbits/sec | 1.27 Gbits/sec | 25.7 ms
Uztelecom | Tashkent, UZ (10G) | 2.48 Gbits/sec | 285 Mbits/sec | 88.5 ms
Leaseweb | Singapore, SG (10G) | 298 Mbits/sec | 295 Mbits/sec | 184 ms
Clouvider | Los Angeles, CA, US (10G) | 896 Mbits/sec | 83.7 Mbits/sec | 166 ms
Leaseweb | NYC, NY, US (10G) | 2.36 Gbits/sec | 3.36 Mbits/sec | 100 ms
Edgoo | Sao Paulo, BR (1G) | 1.47 Gbits/sec | 70.7 Mbits/sec | 226 ms
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Situation is sadly still unchanged. Also no mentioning of this issue on the netcup status page. Support ticket is also unanswered. This is honestly not a good sign.
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I have a similar problem with a new server in vienna, IPV4 download speeds are abysmal (~1MB/s), IPv6 is better, but still not at full performance. Older server in Nuernberg is fine, speeds as expected (full line speed). It seems that the IPv4 Link to Amsterdam is still working, but other are degraded.
You can run a yabs to see if you have a similar problem.
iperf3 Network Speed Tests (IPv4):
---------------------------------
Provider | Location (Link) | Send Speed | Recv Speed | Ping
----- | ----- | ---- | ---- | ----
Clouvider | London, UK (10G) | 2.65 Gbits/sec | 34.6 Mbits/sec | 31.6 ms
Eranium | Amsterdam, NL (100G) | 2.65 Gbits/sec | 2.30 Gbits/sec | 28.6 ms
Uztelecom | Tashkent, UZ (10G) | 1.88 Gbits/sec | busy | 83.9 ms
Leaseweb | Singapore, SG (10G) | 1.80 Gbits/sec | 5.35 Mbits/sec | 179 ms
Clouvider | Los Angeles, CA, US (10G) | 1.07 Gbits/sec | 5.24 Mbits/sec | 159 ms
Leaseweb | NYC, NY, US (10G) | 986 Mbits/sec | 13.5 Mbits/sec | 101 ms
Edgoo | Sao Paulo, BR (1G) | 1.41 Gbits/sec | 9.23 Mbits/sec | 227 ms
iperf3 Network Speed Tests (IPv6):
---------------------------------
Provider | Location (Link) | Send Speed | Recv Speed | Ping
----- | ----- | ---- | ---- | ----
Clouvider | London, UK (10G) | 2.66 Gbits/sec | 38.4 Mbits/sec | 31.8 ms
Eranium | Amsterdam, NL (100G) | 2.66 Gbits/sec | 2.27 Gbits/sec | 28.1 ms
Uztelecom | Tashkent, UZ (10G) | 2.51 Gbits/sec | 1.76 Gbits/sec | 83.8 ms
Leaseweb | Singapore, SG (10G) | 1.19 Gbits/sec | 1.89 Gbits/sec | 179 ms
Clouvider | Los Angeles, CA, US (10G) | 937 Mbits/sec | 59.7 Mbits/sec | 159 ms
Leaseweb | NYC, NY, US (10G) | 1.66 Gbits/sec | busy | 101 ms
Edgoo | Sao Paulo, BR (1G) | 1.60 Gbits/sec | 801 Mbits/sec | 227 ms