Graylog HTTP logging slowdown

[Ghostbird]

I have a micro-service running that used to log to file. I wanted to log these messages to our Graylog instance.

However once I enabled logging over HTTPS to our Graylog instance, the service started to slow down tremendously. Regular requests would suddenly take up to five seconds to complete, instead of fractions of seconds. Do you have any idea what I could have done wrong?

When I remove the Graylog section from the appsettings.json shown below, the speed is back to normal.

In other applications logging to the same Graylog instance's HTTPS endpoint, I have not noticed this slowdown.

appsettings.json

{
  "Serilog": {
    "MinimumLevel": {
      "Default": "Warning",
      "Override": {
        "Microsoft": "Warning",
        "Windows": "Warning"
      }
    },
    "WriteTo": [
      {
        "Name": "Async",
        "Args": {
          "configure": [
            {
              "Name": "Console"
            },
            {
              "Name": "File",
              "Args": {
                "path": "/var/log/TestService/.log",
                "rollingInterval": "Day",
                "retainedFileCountLimit": 30,
                "rollOnFileSizeLimit": true
              }
            },
            {
              "Name": "Graylog",
              "Args": {
                "hostnameOrAddress": "https://graylog.example.org",
                "port": "443",
                "transportType": "Http"
              }
            }
          ]
        }
      }
    ],
    "Properties": {
      "Application": "Test Service"
    }
  },
}