RemoveUnusedFeatures.cs

    var configurationExpression = new MapperConfigurationExpression();
    configurationExpression.RemoveUnusedFeatures();
    configurationExpression.AddProfile<MyMappings>();
    var config = new MapperConfiguration(configurationExpression);
    class MyMappings : Profile
    {
        public MyMappings()
        {
            this.RemoveUnusedFeatures();
        }
    }
    public static void RemoveUnusedFeatures(this Profile profile)
    {
        var internalConfig = profile.Internal();
        internalConfig.FieldMappingEnabled = false;
        internalConfig.MethodMappingEnabled = false;
        profile.ClearPrefixes();
        profile.DisableConstructorMapping();
        var memberConfig = internalConfig.MemberConfiguration;
        memberConfig.DestinationNamingConvention = memberConfig.SourceNamingConvention = ExactMatchNamingConvention.Instance;
        memberConfig.NameToMemberMappers.Clear();
    }