Exactly, slower loading for the first time feels exactly like commodore 64 or nes or Pentium 386 for exsmple, some tape and/or floppy drive read/write sound fx can even make it more retro/nostalgic.
text files and data structures need to get more organized and improved as it might later on tend to very slow iterations if data must be saved it's better to be saved as binary not plain text for sure, other formats like json or csv are also helpful as well, let me know if you need more information.