The OnePlus 15 was tested for gaming performance using games like Call of Duty: Mobile and Genshin Impact. The phone performed well under pressure, dissipating heat effectively. Emulation tests for PS3 and Windows games were also conducted, with the phone handling them smoothly. The phone did not overheat during testing, indicating that OnePlus has fixed previous heating issues. The reviewer recommends the OnePlus 15 for potential buyers due to its stable performance and recent fixes for heating problems.