Some additional and more detailed information on this topic:
In general there is no limit on the size of a vault in bytes or number of files. Performance will not suffer significantly when using large files. Directory listings may get slow when listing directories with many files (1000+). Especially on Windows such amounts cause problems when navigating regular non encrypted directories as well.
In addition some cloud providers impose limits on the files / directories and those apply to Cryptomator as well.
If a cloud provider does only allow 1000 entries per directory Cryptomator will have such limit too. In addition such thing would effect the overall count of directories a vault may contain. Directories are randomly placed inside 1024 containers by cryptomator. For a limit of 1000 entries per directory a vault may only contain around 819000 directories overall before Cryptomator may not be able to create some directories.
There exist some other theoretical limits but those may never be hit. Two examples (including rough estimates):
- Maximum size of a file: around 9 Exabytes; Storing around 270 such files would deplete the storage capacity on earth anyway
- Maximum number of directories in a vault: 1045; If all atoms on earth would be used to form a giant harddrive this still could not hold just the names of those directories