Startup performance issues

The startup of the language server takes on windows >1 sec and on a linux dege device >7 seconds.
We identified the responsible code:

  var Input = Console.OpenStandardInput();
  var Output = Console.OpenStandardOutput();
  //...
      var OmniLanguageServer = await OmniSharp.Extensions.LanguageServer.Server.LanguageServer.From(
        options =>
          options
            .WithInput(Input)
            .WithOutput(Output)
            .ConfigureLogging(x => x
              .AddLanguageServer()
              .SetMinimumLevel(enableDebug ? LogLevel.Trace : LogLevel.Information))
            .OnInitialize((server, request) =>
            {
              initializeParams = request;
              return Task.CompletedTask;
            })
         ).ConfigureAwait(true);

We are currently using version 0.15.0.
Are there any performance improvements in the latest version? Because when we tried to update to the latest version (0.19.0 currently) our software wouldn't compile anymore and then we wouldn't want to spend the effort if no improvements were done.

Start with the LanguageServer.From setup shown in the issue and compare startup behavior between versions 0.15.0 and 0.19.0. Profile initialization on Windows and the Linux edge device, then determine whether a specific regression or avoidable delay can be isolated. Done requires a measured startup improvement and a compatible change, but the issue does not name files or tests.