> I think Cloudflare not allow me millions dns lookups for free )) You can search their terms and conditions, but 1.1.1.1 is free. It should not take you long to write code to try DNS over HTTPS and find out how many lookups you can manage per second. If it blocks you, then you are correct. > >is this a server or workstation? > Workstation. Windows 10 x64.
Workstation versions of Windows are not designed for this/ > I will have same slowdown/limits if I create several hundreds > TSmtpClient instances ? It's not the total number of sockets that is an issue, it's how many new ones you can open per second. It's even fewer with SSL, which many SMTP servers prefer. > How to avoid it ? Use IOCP ? Windows Server? But Microsoft writes IIS as a kernel driver for performance. And I simply don't have experience of testing massive load applications, only light load with a couple of thousand connections. Angus -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
