Slow (old) Windows context menu for several media files, but not all media file types.

Using the old context menu in Windows 11, or Nilessoft Shell, I experience the context menu to be slow for media files like mp3, mp4, mkv, mpg etc. But not all media, like aiff, that is instant. Changing a mp4 to .aiff, and the menu in instant.

Any idea how to solve this?

I think it's related to explorer gathering metadata details for those files. If I turn off the details panel, restart explorer, the menu is instant on the first mp4 file, until I right click another media file that have "details". So not using the details panel didn't work as a workaround.

UPDATE
It's not metadata / details panel as .mpg doesnt have details and is slow, yet .mpg4 is instant.