UPF is a file packer. It can reach speeds of over 2 GB per minute. This is because of its way of working. Everything required is loaded before it is used. Everything used is used sparingly. This give you a quick, lite and easy to use file packer. The only downside is that it does not compress data. For this reason I recommend it is used on large files of 1 GB +. This is because the bigger the file the longer it takes, but more importantly the more it has to compress. This slows down the overall process. For UPF to pack a 3 GB file it will take 1 and a half minutes. To create a ZIP file of a 3 GB file it will take 4 to 5 minutes minimum. So when you need to pack large files or even small files quickly UPF is the answer.