namespace WEB.Filters
{

    //КЕШЬ  use [CacheFilter(Duration = 60)]
    public class CacheFilterAttribute : ActionFilterAttribute
    {
        /// <summary>
        /// Gets or sets the cache duration in seconds. The default is 10 seconds.
        /// </summary>
        /// <value>The cache duration in seconds.</value>
        public int Duration
        {
            get;
            set;
        }

        public CacheFilterAttribute()
        {
            Duration = 10;
        }

        public  void OnActionExecuted(ActionExecutingContext filterContext)  // public override void OnActionExecuted(ActionExecutingContext filterContext).  тут правда ругалось на  override, поэтому убрал.
        {
            if (Duration <= 0) return;

            HttpCachePolicyBase cache = filterContext.HttpContext.Response.Cache;
            TimeSpan cacheDuration = TimeSpan.FromSeconds(Duration);

            cache.SetCacheability(HttpCacheability.Public);
            cache.SetExpires(DateTime.Now.Add(cacheDuration));
            cache.SetMaxAge(cacheDuration);
            cache.AppendCacheExtension("must-revalidate, proxy-revalidate");
        }
    }
     


}
 

namespace WEB.Filters
{
   

        public class CompressFilter : ActionFilterAttribute
        {
            public override void OnActionExecuting(ActionExecutingContext filterContext)
            {
                HttpRequestBase request = filterContext.HttpContext.Request;

                string acceptEncoding = request.Headers["Accept-Encoding"];

                if (string.IsNullOrEmpty(acceptEncoding)) return;

                acceptEncoding = acceptEncoding.ToUpperInvariant();

                HttpResponseBase response = filterContext.HttpContext.Response;

                if (acceptEncoding.Contains("GZIP"))
                {
                    response.AppendHeader("Content-encoding", "gzip");
                    response.Filter = new GZipStream(response.Filter, CompressionMode.Compress);
                }
                else if (acceptEncoding.Contains("DEFLATE"))
                {
                    response.AppendHeader("Content-encoding", "deflate");
                    response.Filter = new DeflateStream(response.Filter, CompressionMode.Compress);
                }
            }
        }

    }

namespace WEB
{
    public class FilterConfig
    {
        public static void RegisterGlobalFilters(GlobalFilterCollection filters)
        {
            filters.Add(new HandleErrorAttribute());
            filters.Add(new InitializeSimpleMembershipAttribute());
            //1filters.Add(new EnableCompressionAttribute());
            filters.Add(new CacheFilterAttribute());
            filters.Add(new CompressFilter());
        }
    }
}

...
   protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();

            WebApiConfig.Register(GlobalConfiguration.Configuration);
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);
            AuthConfig.RegisterAuth();
        }
...

<system.webserver><urlcompression dodynamiccompression=”true” dostaticcompression=”true” dynamiccompressionbeforecache=”true”></urlcompression>
</system.webserver>