Web Api, howto improve performance with ProtoBuf - json

Question

It takes nearly 50 seconds to load a big chunk of 35 MB Json when accessing the Api. So to improve performance I added the WebApiContrib.Formatting.ProtoBuf to my project. The data is displayed in a Kendo UI Grid.
What am I missing here? A dataType or type in the View, or anything like that? And are there other or better ways to improve the performance?
Here some snippets->
POCO-Class:
[ProtoContract]
public partial class KDAuftraege
{
[ProtoMember(1)]
public int AngebotsNummer { get; set; }
[ProtoMember(2)]
public Nullable<int> BesuchsNummer { get; set; }
[ProtoMember(3)]
public Nullable<int> Kennummer { get; set; }
[ProtoMember(4)]
View:
var remoteDataSource = new kendo.data.DataSource({
transport: {
read: {
url: '/api/WebApiAuftraege'
},
},
Controller:
public IQueryable<KDAuftraege> GetKDAuftraeges()
{
//return db.KDAuftraeges.Take(500);
return db.KDAuftraeges;
}
WebApi:
config.Formatters.Add(new ProtoBufFormatter());
Headers:
Cache-Control no-cache
Content-Length 36227588
Content-Type application/json; charset=utf-8
Date Sat, 07 Jun 2014 09:23:54 GMT
Expires -1
Pragma no-cache
Server Microsoft-IIS/8.0
X-AspNet-Version 4.0.30319
X-Powered-By ASP.NET
X-SourceFiles =?UTF-8?B?YzpcdXNlcnNcb2xkc3BvcnRcZG9jdW1lbnRzXHZpc3VhbCBzdHVkaW8gMjAxM1xQcm9qZWN0c1xWaXM0XFZpczRcYXBpXFdlYkFwaUF1ZnRyYWVnZQ==?=
Anfrage-HeaderQuelltext anzeigen
Accept */*
Accept-Encoding gzip, deflate
Accept-Language de,en-US;q=0.7,en;q=0.3
Connection keep-alive
Cookie __RequestVerificationToken=wMVQWPOkXsB2XDIFN_07RJDtKqN_90dLRYaBYJGsFSGEHTcQ1S6e15mPiWrvkMHS8HrAlHYAI0OVSkqtPQHFVMP5DxoyccijSktL_KsoEFU1; .AspNet.ApplicationCookie=RTQ61CfArDWHlWN06eOpZiZY6NmFGp0SwCCuR8bQCtnItSz6S8YTasQu4-uoRQCc-XqWDCZmtOpEb-b0SyIioQPomkm1BrKywMcVwt3bF_JBxORKGg-UNSHyPvFyBohiS1sJ354LpRHIjrPIA8rUexvZih4VrK9lvHu_sm21ncNXXV7jATKAjTdX7J3XvfxRsF11fhgDNtpXPEWxQPjD7Rkj5yvdqI-vbfr9tfQbszUR1O3oOjYcRxUvvVrJ7xnt-caxt-o_Kut1dixLEA241pMGPCHfetWK73Yp148K3X9By6ylHFOTEjjDwHZyHLIrBwwOZ-ujnaOf20jQzeZXaF16bHxeadLYuKK-Z2DpdzaJXPzZd2pBbzHJMFX7USfZmp7OZzLpOitLCMovGHwdRiLD0F2NR1a0iTHCgiZLvA8
Host localhost:19275
Referer http://localhost:19275/MvcAuftraege
User-Agent Mozilla/5.0 (Windows NT 6.3; WOW64; rv:29.0) Gecko/20100101 Firefox/29.0
X-Requested-With XMLHttpRequest

Answer 1

Options 1: Change your view DataSource code (I think this is right)
var remoteDataSource = new kendo.data.DataSource({
transport: {
read: {
type: 'GET',
headers: { Accept: 'application/x-protobuf' },
url: '/api/WebApiAuftraege'
},
},
Option 2: Change your Web API Formatters so that ProtoBuf is the default:
config.Formatters.Insert(0, new ProtoBufFormatter());