TST_SEL_RET (0x02) -- used by far RET to detect cross-privilege returns:
This overhead is mandated by the spec's reliance on promises for buffer management, completion, and backpressure signals. While some of it is implementation-specific, much of it is unavoidable if you're following the spec as written. For high-frequency streaming — video frames, network packets, real-time data — this overhead is significant.，更多细节参见同城约会
The solution to today's Connections #993 is...，详情可参考雷电模拟器官方版本下载
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