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I've just set up a new Windows 11 PC that is (on paper) much more powerful than my previous Windows 10 laptop. However, I'm getting much slower downloads - 14.9 MB/s for the 10 GB test on the new PC vs. 72.4 MB/s on the old PC. Network is the same: wired ethernet, and speedtest is the same on both PCs. New drive is a high end Samsung SSD NVMe.

Comparing the Status windows:

New PC:
System performance (Pystone) 230941 12th Gen Intel(R) Core(TM) i9-12900H AVX2
Download folder speed 819.7 MB/s C:\Downloads\incomplete
Complete folder speed 833.4 MB/s C:\Downloads\complete
Internet Bandwidth 121.35 MB/s 970.8 Mbps

Old PC:
System performance (Pystone) 227936 Intel(R) Core(TM) i7-4510 CPU
Download folder speed 339.8 MB/s C:\Downloads\incomplete
Complete folder speed 345.4 MB/s C:\Downloads\complete
Internet Bandwidth 63.07 MB/s 504.56 Mbps

Note that the Pystone numbers are about the same but the folder download speeds and Internet Bandwidth are much higher on the new PC.

I've done the optimizations listed on the wiki at https://sabnzbd.org/wiki/advanced/highspeed-download:

• Make sure Maximum line speed in Config->General is set to the correct value for your connection (set to 100 MB/s)
• Try different connection numbers for your servers. Start with 8 and increase from there. A higher number will increase the overhead so more connections might actually reduce your speed. (set at 50 - lowering reduces speed even more)
• Turn Off Direct Unpack in Config->Switches to reduce disk load.
• Turn On Pause Downloading During Post-Processing in Config->Switches. This will reduce disk load, as downloading and post-processing are not performed simultaneously.
• Change SSL Ciphers to AES128 or CHACHA20 in Config->Servers. This can slightly reduce CPU load.
• Turn off Unwanted Extensions and Action when encrypted RAR is downloaded, as these use a substantial amount of disk and CPU power.

Any help and suggestions are much appreciated.

Ok, I isolated the problem to the built-in network adapter in the new PC. The built-in adapter is the Intel(R) Ethernet Controller I226-V. Amazingly this is fixed with a simple setting change: see https://www.reddit.com/r/intelnuc/comme ... t/lu8jazs/

• Click Start
• Search for "power"
• Click "Edit power plan"
• Click "Change advanced power settings"
• Expand "PCI Express"
• Expand "Link State Power Management"
• Select "Settings"
• Change it to "Moderate power settings" or "Off"

Downloads are now back to the expected range (70+ MB/s over gigabit connection).

Nice find