I've noticed that some servers are currently very, very slow. It varies, though. A server that's slow today might be fast again tomorrow. If a server is too slow, just switch to another one—one click and you're already on the next server.
Currently there are 79 global server locations with 1 & 10 Gbps port servers.
And another tip: In most cases the TCP protocoll works best. If not, try another protocoll. You can find them under "Settings" in your installed client.
Many, many, many thanks for the implementation of this project to