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Do you have too many files in the SD card? If the quantity is too high the filenames will take all available RAM and the performance will degradate.

Disable the settings below to reduce the RAM use:
 

  // This allows hosts to request long names for files and folders with M33
  #define LONG_FILENAME_HOST_SUPPORT

  // Enable this option to scroll long filenames in the SD card menu
  #define SCROLL_LONG_FILENAMES

 

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