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.
低端机越来越少，中端机越来越难卖，高端机的市场固然在扩大，可门槛依旧很高，这种行业的加剧分化，可能让国产手机厂商上下探索的空间变得更小。往悲观的方向想，这会将整个行业拖入一个新的低谷。
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WebAssembly with no kernel at allWebAssembly takes a fundamentally different approach. Instead of running native code and filtering its kernel access, WASM runs code in a memory-safe virtual machine that has no syscall interface at all. All interaction with the host happens through explicitly imported host functions.
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