Web application moved from Websphere6.0 to 6.1 has Performance Issues

[Vrunda Bapat]

Hi,
Trying to migrate Java Web Application (JDK1.4) from Websphere 6.0 to 6.1 to upgrade to Java5.
To test loaded on local server , gives performance issues while loading or displaying a page.
Performance issue is predominant while loading any page with query.
Being a Java developer and not so much of Websphere admin experience..tried tracing, logging , debugging to identify the problems.
Did set Tivoli performance Viewer to see performance issues via Admin console..nothing unusual as in hung threads or pool connection issue is noticeable via Tivoli other than CPU usage hikes while loading the page.
Can anyone guide on what will be the best way to trace the performance issue as in -
Which tool will help me track down transaction management issues or Hung thread issues ?
What could be problem areas which I should be looking into considering JDK1.4 app compatibility with websphere 6.1?

Any help to get some direction would be appreciated

Thanks,
VrundaB

[Jeanne Boyarsky]

Do you know what is taking the time? If it is literally rendering the page, maybe you have memory issues. WebSphere does use a larger memory footprint with each release.