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I am disabling Kaspersky Internet Security before carrying out any speed tests, and have unticked NordVPN LightWeight Firewall for the NIC. Does QoS Packet Scheduler need to be ticked?

I have enabled LSO, and have reduced the number of RSS queues to 2 (as my laptop has 2 CPU cores), but the CPU is still being maxed out when I run speed tests. I am at a loss as to what else I can do...

Apart from jumbo frames and LSO, the others are already enabled. I will try enabling LSO, but would jumbo frames work with a broadband connection? Would reducing the number of RSS queues from 4 to 2...

Thanks Philip. Any suggestions as to which ones are likely to affect CPU usage please?

The above did not really help - see https://www.speedtest.net/result/10300977161 and https://www.speedtest.net/result/10300969208.

The CPU on my laptop maxed out during the tests.

What I am going to try is increasing Receive Buffers from 512 to the maximum of 2048, and Transmit Buffers from 256 to the maximum of 1024.
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I know it is not a router issue, as the download speeds are fine when I use a bootable Linux USB stick on my laptop. I will change the TCP Window Auto-Tuning back to normal, and see whether I can...

That last one should have read Optimal, TCP Window Auto-Tuning experimental, MTU 1480.

I reset Winsock and TCP/IP, and then tried the following:

Windows default – https://www.speedtest.net/result/10296812773 and https://www.speedtest.net/result/10296818814
Optimal –...

Thanks Philip, I will give your suggestions a try. Should my laptop’s MTU be set to the same as my router’s MTU - this is 1480, as I have a PPPoE connection?

I would be very grateful for some help with improving my download speeds on my Windows 10 laptop. I have a 1 Gbps FTTH broadband connection, which has an average download speed of 900 Mbps. If I use...