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带宽是共享的：雷电4总带宽40Gbps，若同时接4K显示器（占大量带宽）+高速SSD，SSD读写速率会明显下降，重度数据传输选独立带宽接口的拓展坞

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UnverifiedTB4/USB4扩展坞总带宽固定40Gbps，若同时外接双4K显示器（约需20Gbps）+ 高速SSD + 千兆网口，带宽会被抢占导致SSD降速，重度多设备需优先选TB4并接受传输降速85% similar Unverified40Gbps雷电带宽在同时跑双4K显示（约占30Gbps）后留给数据传输的余量有限，接高速NVMe硬盘会掉速；数据密集用户应减少显示占用或用DisplayLink分流80% similar Unverified40Gbps总带宽需在数据传输和视频输出间分配，接双4K屏后留给外接硬盘的实际带宽会下降，NVMe硬盘盒此时可能跑不满2000MB/s，重度存储需求应选带独立PCIe通道设计的雷电坞78% similar Unverified多口集线器的总带宽由上行接口决定并被所有下行口共享，一个USB 3.0（5Gbps）上行口下挂4个硬盘同时读写，实际每个设备只能分到约1.25Gbps，需要多盘高速并发应选双上行通道或雷电方案76% similar Unverified串流4K HDR内容实际码率约15-25Mbps，需WiFi稳定速率≥50Mbps；家庭宽带带宽<100Mbps或多设备共用时优先选带千兆以太网口的流媒体盒（非棒）75% similar

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