Very Slow plugin performance even with ip address connects

Customer using Java Plugin for Windows 1.2.2 and from the applet,
accessing a servlet (entire sample code is attached). Plugin 1.1.x does
not have this problem.

Java plugin performance is very slow when you open a URL connection (or
a socket) back to the host from which applet came. With snoop, we can find
that plugin is trying to make name resolution queries.

But since IP addresses are used everywhere, there should no need for
plugin to lookup the name. For a demonstration, please visit following
URL.
http://203.116.231.10:4048/httptest_desmond/testhttp1.html

(You will have to grant socket permissions to above host).

You will see that at the point of opening the http connection in server (code
is attached in attachments) the applet freezes. It resumes after approx. 5
seconds as seen from snoop traces.

Also, if you put an entry in the 'hosts' file on the window machine such as
203.116.231.10 any-junk.Junk.COM
the performance is dramatically improved. Note that the hostname in the above
entry does not have to be correct, any dummy name will do. Therefore there
is reason to believe that plugin is doing an unnecessary name resolution and
that is degrading the performance to unacceptable level.

In the intranet, the problem is easy to reproduce if you have DNS turned OFF.
On the internet however the problem comes up with DNS on also.