With SSL enabled sonarr becomes really, really slow

I’ve just managed to get Sonarr working with SSL but I noticed it became really slow. If I disable SSL again it goes back to normal.

I think it’s this log I’m getting in Sonarr:

Message
/volume1/@appstore/nzbdrone/share/NzbDrone/Microsoft.AspNet.SignalR.Core.dll Warning : 0 : SignalR exception thrown by Task: System.AggregateException: One or more errors occurred ---> System.IO.IOException: IO exception during Write. ---> System.IO.IOException: Write failure ---> System.Net.Sockets.SocketException: The socket has been shut down
  at System.Net.Sockets.Socket.Send (System.Byte[] buf, Int32 offset, Int32 size, SocketFlags flags) [0x0005c] in /spksrc/native/mono/work-native/mono-3.10.0/mcs/class/System/System.Net.Sockets/Socket.cs:1841 
  at System.Net.Sockets.NetworkStream.Write (System.Byte[] buffer, Int32 offset, Int32 size) [0x0006e] in /spksrc/native/mono/work-native/mono-3.10.0/mcs/class/System/System.Net.Sockets/NetworkStream.cs:415 
  --- End of inner exception stack trace ---
  at System.Net.Sockets.NetworkStream.Write (System.Byte[] buffer, Int32 offset, Int32 size) [0x0008e] in /spksrc/native/mono/work-native/mono-3.10.0/mcs/class/System/System.Net.Sockets/NetworkStream.cs:418 
  at Mono.Security.Protocol.Tls.SslStreamBase.Write (System.Byte[] buffer, Int32 offset, Int32 count) [0x0009e] in /spksrc/native/mono/work-native/mono-3.10.0/mcs/class/Mono.Security/Mono.Security.Protocol.Tls/SslStreamBase.cs:1122 
  --- End of inner exception stack trace ---
  at Mono.Security.Protocol.Tls.SslStreamBase.Write (System.Byte[] buffer, Int32 offset, Int32 count) [0x000d9] in /spksrc/native/mono/work-native/mono-3.10.0/mcs/class/Mono.Security/Mono.Security.Protocol.Tls/SslStreamBase.cs:1132 
  at System.Net.ResponseStream.InternalWrite (System.Byte[] buffer, Int32 offset, Int32 count) [0x00029] in /spksrc/native/mono/work-native/mono-3.10.0/mcs/class/System/System.Net/ResponseStream.cs:132 
  at System.Net.ResponseStream.Write (System.Byte[] buffer, Int32 offset, Int32 count) [0x000dd] in /spksrc/native/mono/work-native/mono-3.10.0/mcs/class/System/System.Net/ResponseStream.cs:165 
  at Microsoft.Owin.Host.HttpListener.RequestProcessing.ExceptionFilterStream.Write (System.Byte[] buffer, Int32 offset, Int32 count) [0x00000] in <filename unknown>:0 
  --- End of inner exception stack trace ---
 --> (Inner exception 0) System.IO.IOException: IO exception during Write. ---> System.IO.IOException: Write failure ---> System.Net.Sockets.SocketException: The socket has been shut down
  at System.Net.Sockets.Socket.Send (System.Byte[] buf, Int32 offset, Int32 size, SocketFlags flags) [0x0005c] in /spksrc/native/mono/work-native/mono-3.10.0/mcs/class/System/System.Net.Sockets/Socket.cs:1841 
  at System.Net.Sockets.NetworkStream.Write (System.Byte[] buffer, Int32 offset, Int32 size) [0x0006e] in /spksrc/native/mono/work-native/mono-3.10.0/mcs/class/System/System.Net.Sockets/NetworkStream.cs:415 
  --- End of inner exception stack trace ---
  at System.Net.Sockets.NetworkStream.Write (System.Byte[] buffer, Int32 offset, Int32 size) [0x0008e] in /spksrc/native/mono/work-native/mono-3.10.0/mcs/class/System/System.Net.Sockets/NetworkStream.cs:418 
  at Mono.Security.Protocol.Tls.SslStreamBase.Write (System.Byte[] buffer, Int32 offset, Int32 count) [0x0009e] in /spksrc/native/mono/work-native/mono-3.10.0/mcs/class/Mono.Security/Mono.Security.Protocol.Tls/SslStreamBase.cs:1122 
  --- End of inner exception stack trace ---
  at Mono.Security.Protocol.Tls.SslStreamBase.Write (System.Byte[] buffer, Int32 offset, Int32 count) [0x000d9] in /spksrc/native/mono/work-native/mono-3.10.0/mcs/class/Mono.Security/Mono.Security.Protocol.Tls/SslStreamBase.cs:1132 
  at System.Net.ResponseStream.InternalWrite (System.Byte[] buffer, Int32 offset, Int32 count) [0x00029] in /spksrc/native/mono/work-native/mono-3.10.0/mcs/class/System/System.Net/ResponseStream.cs:132 
  at System.Net.ResponseStream.Write (System.Byte[] buffer, Int32 offset, Int32 count) [0x000dd] in /spksrc/native/mono/work-native/mono-3.10.0/mcs/class/System/System.Net/ResponseStream.cs:165 
  at Microsoft.Owin.Host.HttpListener.RequestProcessing.ExceptionFilterStream.Write (System.Byte[] buffer, Int32 offset, Int32 count) [0x00000] in <filename unknown>:0

Which version of Sonarr?
Which version of mono?

Sonarr version: 2.0.0.3004
Mono version: 3.10.0-4 (latest version from synocommuntiy)