Issue: Browsing JPG photos in XnView MP has suddenly become very slow

[Commodoortje]

Issue: Browsing JPG photos in XnView MP has suddenly become very slow.

Loading the next photo takes about 3–4 seconds per image.
The photos are stored on a Synology DS723+ NAS (20 GB RAM).
Other applications (IrfanView, Windows Photos, Synology Photos) browse the same files without any delay.
The problem does not occur when the photos are copied to my local SSD (Windows 11 system drive).
The issue appeared suddenly from one day to the next, without any obvious change in my workflow.
I have tried several settings and troubleshooting steps, but so far I have not found a solution.

Has anyone experienced a similar issue or found a fix?

Version XnView MP 1.11.2 [10051] 64-bit (Apr 300 2026 - Libformat 7.239 (Windows)