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+--- Thread: Synology NAS slows down when accessing remotely after DSM update – Please help check (/showthread.php?tid=12490)
Synology NAS slows down when accessing remotely after DSM update – Please help check - earthworm - 11-20-2025
Hi everyone,
I have a problem with my Synology NAS after updating to the latest DSM version. When accessing remotely using QuickConnect or connecting via DDNS, the download speed drops sharply, only about 2–3 MB/s, even though my connection is stable.
Some information I have checked:
NAS uses Synology DS920+
DSM just updated the new version last week
Internal LAN connection is still fast
Tried changing the port but the remote speed still drops
No CPU or RAM warning appears
I want to ask:
Has anyone experienced a slow NAS after updating DSM?
Is there a setting in the new DSM that limits the external connection speed?
Should I rollback to the previous DSM version, or is there any optimization method before doing this step?
I hope someone with experience can share more. I want to handle it thoroughly because the NAS serves daily work.
Thanks everyone.