ASP.Net is too slow - asp.net

Question

Name: http://localhost:50692/bfea4cb4df42428dac17db20239d7d53/arterySignalR/poll?transport=longPolling&connectionToken=AQAAANCMnd8BFdERjHoAwE%2FCl%2BsBAAAAY8r9H53SS0mPVZi%2BJaxhmgAAAAACAAAAAAADZgAAwAAAABAAAACxV1Yze0hqYW74IbMt%2F3ccAAAAAASAAACgAAAAEAAAANgm3EjRWVa2PG4Y0yKe170oAAAA3HRUEcQdeyzIzSRY1%2B88s1AWq3zAs3dVYKoE8nrk0XpbjrLFXenhzRQAAACtcSj%2FmTPLei2BFkjrPAqbbTphxA%3D%3D&messageId=d-90D2E0DD-B%2C0%7CC%2C9%7CD%2C0&requestUrl=http%3A%2F%2Flocalhost%3A53648%2F&browserName=Chrome&userAgent=Mozilla%2F5.0+(Windows+NT+6.1%3B+WOW64)+AppleWebKit%2F537.36+(KHTML%2C+like+Gecko)+Chrome%2F43.0.2357.132+Safari%2F537.36&tid=8&_=1436780235916
Status: 200
Type: xhr
Initiator: browserLink:37
Size: 336 B
Time: 6.0 seconds
From the Network tab in Inspect Element in Chrome.
It just does this over and over again without getting anywhere. I have no idea what parts of my code to give you, and I'd rather not swarm you with the whole project. Tell me what you need to see and I'll give you it.
When I click "copy as HAR" I get this: http://pastebin.com/tqqNGYpW
It's interesting that the 'log' at the top shows version 1.2, and I just uninstalled log4net version 1.2 and installed log4net version 2.x instead to fix another problem. The problem was related to some 32-bit 64-bit problems between LinqToExcel (it uses log4net).
This is almost certainly LinqToExcel-related. It only hangs sometimes. It continues doing the above even after I've stopped the loading process.
Further info:
The page that hangs displays Excel files from LinqToExcel. The page that does not use LinqToExcel does not hang. It doesn't matter if the page has Excel files to display, or not.
The hang occurs when I call the Index() method.
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Linq;
using System.Net;
using System.Web;
using System.Web.Mvc;
using steer.Models;
using LinqToExcel;
namespace steer.Controllers
{
public class FilesController : Controller
{
private UpFile.UpFileDBContext db = new UpFile.UpFileDBContext();
// GET: Upload
public ActionResult Index()
{
return View(db.UpFiles.ToList());
}
// GET: Upload/Details/5
public ActionResult Details(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
UpFile upFile = db.UpFiles.Find(id);
if (upFile == null)
{
return HttpNotFound();
}
var excel = new ExcelQueryFactory(AppDomain.CurrentDomain.BaseDirectory+"Uploaded\\"+upFile.Name);
var firstSheet = excel.GetWorksheetNames().First();
var excelRows = from c in excel.Worksheet(firstSheet)
select c;
ViewBag.excelRows = excelRows;
ViewBag.excelColumns = excel.GetColumnNames(firstSheet); ;
ViewBag.numberOfColumns = ViewBag.excelColumns.Count;
return View(upFile);
}
}
}

Answer 1

This is just a guess, but I'm assuming you have files you've uploaded in a database table and the page that is slow is the index which just shows the list of files.
If you have all the file details and the file contents in the same table then I suspect you're loading all those file contents for every single file every time you do an index.
Assuming this is the case you can either tell the linq to just select the info you want, or split out the data across 2 tables to make it so that you only end up with the data if you explicitly link it in.