Something, something, Windows 10 is dead, bin your computers now

I'm experiencing serious performance issues with SMB file transfers on Windows 11 after upgrading to versions 24H2 and 25H2. Transfers to Isilon storage clusters over WAN are extremely slow, unlike on older Windows 10 or earlier Windows 11 versions, which had great performance. Despite downgrading SMB dialects and adjusting client settings, the problem persists, and Dell support has suggested it may be related to these recent Windows updates or network issues. Additionally, Windows Servers and newer server instances also show similar issues when accessing the same storage, indicating a possible compatibility problem with third-party storage solutions and the latest Windows builds. This problem is affecting productivity and is a significant concern for our environment, especially since older Windows versions and even some server OS versions handle these transfers smoothly. It seems that recent Windows updates may have broken SMB performance with certain storage systems, and we need advice or solutions to resolve this critical issue before it impacts more operations.