Baseline, without any tunnels:
All tests were done with Wireguard and 1400 MTU.
10 Gb/s servers in Netherlands:
Menkent, 18% load, 213 users:
Piautos, 25% load, 198 users:
Dalim, 20% load, 245 users:
Other EU servers:
Switzerland, 10 Gb/s, Alpherg - 21% load, 287 users:
Norway, 1 Gb/s, Ophiuchus, 77% load, 103 users:
Estonia, 1 Gb/s (or is it more?), Alruba, 82% load, 79 users:
Download speeds seem to be mostly okay-ish on all servers, but something is up with the upload speed. Not sure what causes it to drop significantly.
Will say that we definitely need more 10 Gb/s servers.
I think you should try using servers in other EU countries as well.
Server in Estonia is interesting, because it seems to always give me good download speed, even when it's loaded to 100%.
Old screenshot from it: