For me it was turning off "Autodetect subtitle files" in VLC.
Go to Tools > Preferences > Show All Settings > Scroll down to "Subtitles / OSD" under video (or just search for "autodetect subtitle") in the search bar > Then uncheck "Autodetect subtitle files"
SMB Slow or Delayed Initial Access time with VLC
in General Support
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For me it was turning off "Autodetect subtitle files" in VLC.
Go to Tools > Preferences > Show All Settings > Scroll down to "Subtitles / OSD" under video (or just search for "autodetect subtitle") in the search bar > Then uncheck "Autodetect subtitle files"