We used WinZip not only to measure compression time, but also decryption time. We measured the time each CPU took to decompress and decrypt 200 JPEG images, 125 of them at 10 megapixels and 75 of them at six megapixels. The total size of all the photos was around 830 MB. The results below are given in seconds, so the lower the number the better.
Decompressing and decrypting files, the Core i5-2500K (3.30 GHz) was, again, the fastest CPU: 18% faster than the Core i5-661 (3.33 GHz), 23% faster than the Phenom II X4 970 (3.5 GHz), and 32% faster than the Phenom II X4 975 (3.6 GHz).