The Russians excel at this art and export their equipment to many nations. It appears that designing air superiority aircraft primarily for radar stealth is an error. The USAF has never appreciated that speed without persistence is meaningless. Proof Six USAF aircraft capable of Mach 2.2 never exceeded 1.4 Mach in combat over North Vietnam in 10 years of war, in hundreds of thousands of sorties. The F 15 has never demonstrated its performance guarantee of Mach 2.5 flight in a combat configuration on a realistic combat mission profile.
Cruise means covering distance efficiently.
Fighters with wings properly sized for subsonic maneuver achieve efficient supersonic flight at altitudes of 60,000 feet requiring partial afterburning thrust. This may be unknown to the testers since the test program limits testing to below 50,000. The proper cruise condition may remain unknown. The GAO report that the F 22 has demonstrated supercruise is specious and misleading. No report of distance traveled or persistence at those speeds was made.