Better get my patch located at J2O
Go to Downloads, then Other section and look for a file called:
"Jazz 2 List Servers built into .exe file"
It works with 1.23, there is another version for TSF, but use that one now.

Replace your old Jazz2.exe with the one on there, the new list servers are built on it and it's faster than the normal one.
Give it a try.
And if you don't like it just backup your old Jazz2.exe and done.