After several rounds of testing, it can be confirmed that it is a problem with the fusion network card driver. When the network was blocked several times, the network configuration was switched to NAT and then switched back, and the network returned to normal. This is a bug
Original Message:
Sent: Jul 18, 2025 09:42 AM
From: Technogeezer
Subject: The network became extremely slow running win11 arm on my macbook M4
There's no link that I can give you because Broadcom does not provide access to their technical support team for Fusion. This forum - along with product documentation found at techdocs.broadcom.com and tech notes - are the available types of support for Fusion.
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- Paul (technogeezer)
vExpert 2025
Original Message:
Sent: Jul 18, 2025 04:45 AM
From: bai qiang
Subject: The network became extremely slow running win11 arm on my macbook M4
thanks your advice. and could you please give me the link for the official Broadcom support? I will send this issue to them to see if there is any other available suggestions. thanks again!
Original Message:
Sent: Jul 17, 2025 11:27 AM
From: Technogeezer
Subject: The network became extremely slow running win11 arm on my macbook M4
Just a reminder: this is a user-to-user community and not official Broadcom support. We try to help each other out to the best of our ability or time -- and occasionally we'll find a Broadcom employee here, but it's not guaranteed.
Have you checked with the software developer to verify that they support or have tested their software running on Windows ARM? Software compile for Intel Windows runs under Microsoft's Prism translator (the equivalent of Apple/s Rosetta 2), and that introduces another layer of complexity to the problem.
The only other suggestion I have is to start using Windows performance monitoring tools within the VM while the issue is happening to get an idea what might be occurring - at least measurements can give an indication of where to look next.
Another idea - you might want to try upgrading to the latest Fusion version (13.6.4). Some changes have been made in the vmxnet3 virtual graphics adapter (the adapter type used by Windows ARM virtual machines) to address a security issue - perhaps the changes might have an impact on what you're seeing.
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- Paul (technogeezer)
vExpert 2025
Original Message:
Sent: Jul 17, 2025 04:34 AM
From: bai qiang
Subject: The network became extremely slow running win11 arm on my macbook M4
any feedback?
Original Message:
Sent: Jul 13, 2025 12:30 PM
From: Technogeezer
Subject: The network became extremely slow running win11 arm on my macbook M4
Switching from bridged to NAT does not change the network driver in the VM - it's still using the vmxnet3 VMware network adapter provided by Fusion. It's only changing the virtual network that's in use by the virtualized adapter.
Does the network work well when configured via NAT?
I'd start doing some additional methodical testing to see where the bottleneck is (with tools that can actually measure the response time of the network, host and guest operating systems. At a minimum, network performance testing (with latency measurements) should be done from the host and guest, and on both the local network and the wide-area networking.
Ancecotal evidence, while helpful, isn't enough to pinpoint what the true issue is. This could be anything from a poorly performing application when running under Windows ARM to network configuration issues outside the VM.
There have been infrequent issues reported of with some programs performing badly when 3D acceleration is enabled for the Windows VM. Have you tried disabling 3D acceleration and seeing if that changes anything.
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- Paul (technogeezer)
vExpert 2025
Original Message:
Sent: Jul 13, 2025 04:59 AM
From: bai qiang
Subject: The network became extremely slow running win11 arm on my macbook M4
because when I met this network issue each time, my current workround is that I transfer network config from bridge to nat, then transfer back to bridge, it gave me that feeling that the network could become improved to a certain extent, I guess the real problem could exist in network driver in vmwaretools
Original Message:
Sent: Jul 13, 2025 12:57 AM
From: Technogeezer
Subject: The network became extremely slow running win11 arm on my macbook M4
Also, is your stock trading software natively compiled for Windows ARM, or is compiled for Windows Intel (running under Microsoft's translator).
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- Paul (technogeezer)
vExpert 2025
Original Message:
Sent: Jul 13, 2025 12:54 AM
From: Technogeezer
Subject: The network became extremely slow running win11 arm on my macbook M4
I can't say that I've seen a lot of people complain about "obvious network problems", although you can search the forum to double check my recollection.
Can you describe what troubleshooting you did and what tests you performed that led to your conclusion that there might be a problem with the virtual network driver?
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- Paul (technogeezer)
vExpert 2025
Original Message:
Sent: Jul 12, 2025 05:26 AM
From: bai qiang
Subject: The network became extremely slow running win11 arm on my macbook M4
I installed vmware fusion 13.63(24585314) on my macbook air(M4 chip with 10 cores) and I installed one win11 arm system by using fusion with the following configuration:
cpu: 6 ; mem: 5012M ; network: bridged
I activated my window in the normal way, and removed malantivirus process that occupied too much cpu time on windows. the restarted my vm.
Later I started my stock trading software called Tong Hua Shun(in china) that needs heavily on-time network communication, but this software became too much slow on my vm.
I tried many times to debug and found that it is very possible that the reason comes from network driver included in vmwaretools.
So my question is : right now is there any obvious network problems in vmware fusion? any other optimization or workround for this ? thanks your help!