CPU and memory load constantly increase

I just installed Hangfire in my MVC webapp using VS2015 and MongoDb provider. Running the app in IIS Express with no jobs scheduled cause memory and CPU load grows up constantly (IIS Express Worker Process constantly at 50% CPU).

The process is “Microsoft Visual Studio Standard Collector”. Turning off Hangfire the process works normally.

I just use default code:

public void ConfigureHangfire(IAppBuilder app)
    var mongoConnectionString = ConfigurationManager.ConnectionStrings["MongoConnection"].ConnectionString;
    var mongoDatabaseName = ConfigurationManager.ConnectionStrings["DatabaseName"].ConnectionString;

         .UseMongoStorage(mongoConnectionString, mongoDatabaseName);


What’s wrong?