How to fix: slow network speed with Windows 11 to local NAS via Samba / SMB Share

Problem: I replaced my Windows 10 computer with a new Windows 11 one. On W10 I usually see a throughput to my Synology NAS of close to 1 Gbit/sec. On W11 the throughput was ways slower: I only got ~300 Mbit/sec when copying to/from the Samba Share.

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