Following the installation of the May Updates for Windows 11, users started reporting the slow performance of L2TP and IPsec VPN connections. While the VPN establishes successfully, subsequent speed is significantly reduced, leading to frequent timeouts and disconnections of RDP connections. The issue only appears when the device is connected to the network over Wi-Fi.
Users and administrators have noted that VPN bandwidth issues have been noticed since installing the optional KB5025305 April 2023 preview update, but Microsoft has included all of the changes made in the stable KB5026372 update, released on May 9, 2023.
Microsoft is aware of the issue and is working on a fix.
At the moment, to solve the problem, you need to remove the problematic updates. But keep in mind that removing KB5026372 will also remove all recent security patches from the system.
Sources: BleepingComputer, thecommunity
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