EWS managed API AutoDiscover is running very slow - exchangewebservices

Question

I'm using EWS API for consuming outlook 365 mail service.
When I'm performing any mail operation it's running slow.
I have written the code mentioned below:
ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2013_SP1);
service.Credentials = new WebCredentials("usernm", "pwd");
service.EnableScpLookup = false;
service.AutodiscoverUrl("user",RedirectionUrlValidationCallback);
That last line takes 16 seconds before the connection is successful.
Is there any way to make the performance faster?

Answer 1

Hard to say...not saying this is the answer
but try this and let me know.
I see a difference in that i dont pass RedirectionUrlValidationCallback in the autoDiscoverUrl and I don't set EnableScpLookup flag, dont know what that is for. let me know
public ExchangeService GetService( string autoDiscoverEmailAddress, string authEmailAddress,string authEmailPassword, string domain = null, ExchangeVersion verion = ExchangeVersion.Exchange2010_SP2 )
{
try
{
ServicePointManager.ServerCertificateValidationCallback = CertificateValidationCallBack;
ExchangeService svc = new ExchangeService(verion);
//svc.UseDefaultCredentials = true;
if (!string.IsNullOrWhiteSpace(domain))
{
svc.Credentials = new WebCredentials(authEmailAddress, authEmailPassword, domain);
}
else
{
svc.Credentials = new WebCredentials(authEmailAddress, authEmailPassword);
}
svc.AutodiscoverUrl(autoDiscoverEmailAddress);
return svc;
}
catch (Exception)
{
throw;
}
}