What’s the fastest way to upload files on cPanel hosting?

The fastest way to upload files is through the cPanel file manager if you’ve only got a couple files, however if you have a lot of uncompressed files, an FTP client would be the best choice. If you still wish to upload files through cPanel, compress your files and then commence with the upload. There may be a limit on file sizes you can upload, so you can either break them down into several compressed archives or upload everything via FTP.