The reason I asked because we had the same issue and Oracle had recommended this following patch. You can try this too.
Patch 14807119 : BUG FOR PATCH OF PERFORMANCE BUNDLE 1 ON EM 12C PS1 (OMS)
Kindly review the following document as well :
Announcing Enterprise Manager Cloud Control 12c Release 126.96.36.199 Performance Patch Bundles Dec 2012 (Doc ID 1509282.1)
That worked like charm. Navigation is very fast now between screens. Thanks TSharma.
When you clicked the database in target list,its still little slow but better than before.
Ansari - T: I already had applied the patches even before saw your reply. Does the path you mentioned is going to include the patches mentioned by TSharma?
That is the document for the patch , A humble suggestion further would be to upgrade to latest version 188.8.131.52 to enjoy your Cloud Control and its new features .
Kindly review the upgrade documentation :