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LyraNovaHeart Gorts

Joined: 15 Apr 2025 Age: 27 Posts: 48 Location: Los Angeles, California
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Posted: Thu Jul 17, 2025 5:17 am Post subject: Possible Fix For Slow SMB Speeds on Windows 11 23H2 |
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Hey there! Of course, SMB had to be a little shit today, and it decided "let's be slow as fuck". Average transfer speed at first was 17MB/s (~137Mbps), then after a restart, I got around 36MB/s avg (~289Mbps). This isn't ideal, especially when both endpoints are fast enough, given my setup
Server (1 Gbps) ----> Router (1Gbps) ----> Laptop (866Mbps, 802.11ac Wi-Fi 5).
I expect more than 36MB/s, ethernet also weirdly wasn't affected, and while searching the web, I stumbled upon this command:
| Code: | | netsh int tcp set global rss=enabled |
Decided to try it after, what do you know, somehow that fixed this mess. Went from 36MB/s to 70MB/s, much better.
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 _________________ I'm one day closer to being who I wanna be~ |
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alyx Member
Joined: 07 Aug 2024 Posts: 18
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Posted: Thu Jul 17, 2025 9:38 am Post subject: why this works |
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just explaining what this does and why it works
this command enables rss (obvious) which is otherwise known as receive side scaling. to put it simply, it distributes network receive processes across multiple cpus in a multi processor system (keep in note this doesnt use hyperthreaded cores, so itll only make use of say, 14c in a 14c28t system
heres the microsoft article on it: https://learn.microsoft.com/en-us/windows-hardware/drivers/network/introduction-to-receive-side-scaling
why this is off by default is beyond me |
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VCSMaster Member

Joined: 25 May 2025 Age: 25 Posts: 126 Location: Southeastern USA
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Posted: Sun Jul 27, 2025 7:10 pm Post subject: |
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| Interesting. I wonder if this is a new change for Windows 11, since I've never had to make this adjustment on anything I use. All my machines are networked via SMB 1.x to have the same shared storage. Even in XP I've never really noticed speeds so low. |
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