Receive Segment Coalescing State : enabled Receive Window Auto-Tuning Level : normalĪdd-On Congestion Control Provider : default What does the command netsh interface tcp show global show on the system? On my PC the output looks like this: TCP Global Parameters We just need to find out why no windows scaling was negotiated - this may be because of a system setting or intervention by some third party software. Notably missing from those options is a "window scaling" option, so the maximum windows size is the maximum unsigned value representable with 16 bits. The future "fate" of the maximum performance of the connection is decided in the first packet sent (the TCP SYN from the client to the server) the TCP options in that packet are: "mss 1460,nop,nop,sackOK". Those values give a theoretical maximum data transfer rate of 1000 / 50 * 64 = 1.28 megabytes per second or 10.2 megabits per second. That is because the "round trip time" (RTT) for this connection seems to be about 50 milliseconds and the maximum receive window is about 64 kilobytes. There are long periods of time when no data is transferred. The problem becomes apparent when we zoom in on a section of the graph: Superficially, it looks "OK" and we can see that about 7 megabytes are transferred in 6 seconds (giving 1.2 megabytes per second or 9.3 megabits per second). I've tried everything else that's easily google-able. Tech supports I've tried working with: HP, my office, my ISP.We don't use a VPN for work (everything is on SharePoint).Seeing the same speeds on safe mode with networking, and after a clean boot.Updated network drivers, ran Windows update, re-installed network cards.Swapped cables, factory reset router, power cycled router and modem.For file transfers over LAN I'm seeing speeds over 200 Mbps.Both PCs are on the same Ethernet network.Here are all the things I've already tried and ruled out: For the work I do, 10 Mbps is nowhere near sufficient. I should be getting 300 Mbps, and I'm not even getting 10% of that in practice - this is a huge slow down. Note that shows fast speeds, but what I'm seeing on is much closer to what I'm actually experiencing when downloading large files. On my personal PC, I am seeing these speeds in speed test apps, and also when downloading large files.īut, on my work PC, I am getting much slower speeds in practice. My ISP provides internet speeds of 300 Mbps up / 10 Mbps down.
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