var schema = SchemaBuilder.FromObject<MyContext>();

schema.Type<Person>()
    .AddField("weather", "Current weather for this person's location")
    .ResolveAsync<WeatherService>((person, weatherService) =>
        weatherService.GetWeatherAsync(person.Location));

schema.Type<Person>()
    .AddField("expensiveOperation", "Resource-intensive operation")
    .ResolveAsync<ExpensiveService>((person, service) =>
        service.DoExpensiveWorkAsync(person.Id),
        maxConcurrency: 5); // Only 5 concurrent operations for this field

var executionOptions = new ExecutionOptions
{
    ServiceConcurrencyLimits = new Dictionary<Type, int>
    {
        [typeof(WeatherService)] = 10,  // Max 10 concurrent weather calls
        [typeof(DatabaseService)] = 3,  // Max 3 concurrent database operations
        [typeof(EmailService)] = 2      // Max 2 concurrent email sends
    }
};

var result = await schema.ExecuteRequestAsync(query, context, serviceProvider, executionOptions);

var executionOptions = new ExecutionOptions
{
    MaxQueryConcurrency = 20  // Maximum 20 concurrent operations across entire query
};

var result = await schema.ExecuteRequestAsync(query, context, serviceProvider, executionOptions);