c# - .NET HttpWebRequest Speed versus Browser -

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i have question regarding performance of .net httpwebrequest client (or webclient, gives similar results).

if use httpwebrequest request html page (in case news.bbc.co.uk) , analyse speed (using httpanalyzer) @ response read application, slower browser (firefox, chrome, ie) requesting same resource (all caches cleared etc). .net application takes approximately 1.7 seconds versus 0.2 - 0.3 seconds browser.

is purely down speed , efficiency of code / application or there other factors consider?

code follows:

httpwebrequest request = null;  uri uritest = new uri("http://news.bbc.co.uk");  request = (httpwebrequest)webrequest.create(uritest);  request.method = "get"; request.keepalive = true; request.headers["accept-encoding"] = "gzip, deflate";  httpwebresponse response = (httpwebresponse)request.getresponse();  response.close();

if make 2 requests second 1 happen more quickly?

i have notice speed disparities between browsers , webclient or webrequest. raw speed of response can drastically different - not time!

there few things caused by:

  • it .net bootstrapping happens. .net assemblies aren't loaded , jitted until used, therefore can see significant speed degradation on initial call piece of code if application has been running ages. okay - .net framework ngen'd - there's still bridge between code , .net framework build on fly.

  • just checking you're running without debugger attached , don't have symbol server switched on - symbol server , vs interrupts programs symbols downloaded, slowing them down bucket-loads. sorry if insult ;)

  • browsers coded make efficient use of few underlying sockets; , opened , primed browser there. 'our' code uses .net webclient/webrequest totally inefficient in comparison, initialised anew each time.

  • there lot of platform resources associated networking, , whilst .net makes easier code networks, it's still bound same platform resource issues. ergo, closer platform are, faster code be. ie , firefox et al native , therefore can thrown around system resources natively; .net isn't , therefore marshalling(=slow) required set things up. obviously, once port opened , being used, however, .net still no slouch; never fast well-written non-marshalled native code.


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