@AlexTP, Thank you very much for the nice words. CudaText made my life easier—the same goal I had with Pack. That makes hearing your words more special. I will update the website too.
@domasz, You are right to a point, but the reason Pack is faster is not mainly because of smaller write size.
You need to read many files, compress them (while keeping random access on, something tar/tar.gz does not offer, and it is a great point to consider) and write them in a faster time.
But to demonstrate the speed for you, I disabled Press and ran the Linux test again:
tar: 4.7 s, 1.31 GB
Pack (with no Press): 1.8 s, 1.25 GB
Still, more than 2.5X faster, and still gives a smaller result!
Pack does not offer the No Press option as there was no point for it, it can become `even` faster with Press and save smaller data on the disc.
Please test more and comment with your thoughts.