In Oracle Enterprise Manager Database Control, the Performance screen (Database home page > Performance tab) is the dedicated dashboard showing host CPU, active sessions, wait classes, and top SQL/sessions consuming resources — the natural first stop when performance suddenly degrades. The Main (home) screen gives only a general status overview, the Administration screen is for configuring schema/storage/security objects, and the Maintenance screen handles backup/recovery and patching tasks — none of these are built for diagnosing a sudden performance drop.