Pictures - PSD (Highly Compressible)

Compression Rate

The best compressor of this fileset was WinRK again. It astounded us by reducing the fileset size to just over 89MB. That's a space saving of almost 111MB. Very impressive. Even the closest contender, 7-Zip, could only reduce the size of the archive by 103MB.

The worst compressors, by far, were the trio of WinZip, ARJ32 and gzip. They only managed to reduce the archive size by 63-64MB or 32%.

Compression Speed

When it came to compression speed though, the trio of gzip, ARJ32 and WinZip were the fastest compressors. gzip was the fastest at almost 11MB/s while ARJ32 and WinZip delivered compression speeds of 7.6MB/s and 7MB/s respectively. bzip2 also did pretty well, with a compression speed of 4.6MB/s.

WinRK was, again, the slowest compressor tested. Again, it took almost 8 minutes to complete the test.

Compression Efficiency

The compression efficiency rating is a simple way to evaluate the efficiency of each data compressor. This way, we can see which compressor can save the most space in the least time.

Please note that a higher efficiency rating does not mean the compressor is better. It just means the compressor has a better compression-to-speed ratio. A more efficient compressor is, of course, always more desirable than a less efficient one.

Thanks to its super-fast compression speed, gzip was the most efficient data compressor even though it only has an average compression rate. It was over 40% more efficient than the next most efficient compressor, ARJ32.

The most inefficient compressor was undoubtedly WinRK. The really long time it took to compress the fileset completely offset the amount of space saved.