IIS performance improve - asp.net

Question

Currently:
I have a ASP NET project, which utilises several ASHX.
it runs barely acceptable with daily 50000 login api calls(and each login comes diff amount of other API calls)
but now it takes >1min with daily 150,000 login api calls.
to t/shoot the problem, these thing I done on 1 of the API with sproc call which only retrieve data:
1) I run it in another brand new instance, in local-machine, it runs less than 100milisec; current web-instance runs > 1min
2) I run the sproc alone in SSMS, it take < 1sec; current web-instance runs > 1min
3) I did local parameter assignment on that particular sproc, to prevent parameter sniffing and re-built and re-exec, same result.
4) the part the serialize the Json(newtonsoft) uses static, also very fast, less than 1 sec.
I ran "http://tools.pingdom.com/fpt/" and indeed very slow; but I am not sure why it's slow.
I tried to use "DebugView" ("https://technet.microsoft.com/en-us/library/bb896647.aspx"), since it can write plenty log without file-locking, but not sure how to put it works for web application.
Anyway/ tool to capture the independent begin_request & end_request time externally and accurately? (I tried to put the time span in Global.asax, but get some null parameters sometimes) Best if anyone has the idea to pinpoint the part that caused it.
sample timespan test:
private string single_detail(HttpContext context)
{
PlayDetailApiResult o = new PlayDetailApiResult
{
...
};
string json = generateJsonFromObj(o); // init default
try
{
{
{
long current = 0;
DateTime dtStart = DateTime.Now;
// call sp
int ret = plmainsql.getPracticeQualificationTimeLeft(...);
DateTime dtEnd = DateTime.Now;
TimeSpan ts = dtEnd - dtStart;
LoggingHelper.GetInstance().Debug("single_detail getPracticeQualificationTimeLeft's duration(ms): " + ts.TotalMilliseconds);
if (ret != 0)
{
o.Code = ...;
}
}
DateTime dtStart_1 = DateTime.Now;
json = generateJsonFromObj(o);
DateTime dtEnd_1 = DateTime.Now;
TimeSpan ts_1 = dtEnd_1 - dtStart_1;
LoggingHelper.GetInstance().Debug("single_detail generateJsonFromObj's duration(ms): " + ts_1.TotalMilliseconds);
}
}
catch (Exception ex)
{
LoggingHelper.GetInstance().Debug("single_detail : " + ex.Message + "|" + ex.StackTrace);
}
finally
{
}
return json;
}
most of the result:
2015-03-04 18:45:29,263 [163] DEBUG LoggingHelper single_detail getPracticeQualificationTimeLeft's duration(ms): 5.8594
2015-03-04 18:45:29,264 [163] DEBUG LoggingHelper single_detail generateJsonFromObj's duration(ms): 0
these thing I noted.
1) computer's processor usage and memory usage: memory is at 70%, which i think still is not peak
2) check if Gzip compression is enabled : my json runs on mobile (iOS/Android/WM); some code changes needed, and not tested to prevent any compress-decompress issue; as compression also increase CPU usage at the same time

Answer 1

You can also try miniprofiler. It is very easy to use and displays the execution time for every step or function you want to monitor.
Check out http://miniprofiler.com/