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 02 May 2007
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 Dr. Adrian Wong
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Compression Comparison Guide Rev. 2.0
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Documents

Compression Rate

Data Compressors
Original Size (bytes)
Compressed Size (bytes)
Space Saved (bytes)
WinRK
200,007,960
99,990,213
100,017,747
7-Zip
200,007,960
113,659,331
86,348,629
WinAce
200,007,960
113,720,536
86,287,424
WinRAR
200,007,960
114,764,928
85,243,032
Squeez
200,007,960
115,403,577
84,604,383
SBC Archiver
200,007,960
115,575,403
84,432,557
StuffIt
200,007,960
121,781,510
78,226,450
bzip2
200,007,960
126,719,413
73,288,547
WinZip
200,007,960
127,322,290
72,685,670
gzip
200,007,960
128,570,275
71,437,685
ARJ32
200,007,960
129,750,283
70,257,677

In this test of four different document types, WinRK was the champion. It was ahead of the rest of the pack by reducing the fileset size to under 100MB. That's a space saving of just over 50%. It was about 16% better at compressing this fileset than the quintet of 7-Zip, WinAce, WinRAR, Squeez and SBC Archiver that followed it with compression rates of about 43%.

The other data compressors did pretty well too, showing compression rates of 35-39%. The poorest compressor, ARJ32, managed to compress the fileset to below 130MB which is 30MB larger than WinRK's archive.

 

Compression Speed

Data Compressors
Original Size (bytes)
Time (s)
Speed (KB/s)
gzip
200,007,960
15.38
13004.4
ARJ32
200,007,960
17.08
11710.1
WinZip
200,007,960
25.68
7788.5
bzip2
200,007,960
54.36
3679.3
7-Zip
200,007,960
54.86
3645.8
Squeez
200,007,960
61.28
3263.8
SBC Archiver
200,007,960
70.28
2845.9
StuffIt
200,007,960
89.18
2242.7
WinRAR
200,007,960
90.04
2221.3
WinAce
200,007,960
147.19
1358.8
WinRK
200,007,960
330.62
604.9

When it comes to compression speed though, gzip was the king. It only took 15 seconds to compress 200MB of documents! At 13MB/s, it was far ahead of the rest of the pack. Only ARJ32 came in close at 11.7MB/s.

Although it was the best compressor of this fileset, WinRK was also the slowest compressor. It took over 5.5 minutes to complete the test. It was more than twice as slow as the second slowest compressor, WinAce.

 

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.

The most efficient data compressor when it comes to this bunch of assorted documents was gzip. Its really fast compression speed plus its reasonably good compression rate made it a really efficient compressor. ARJ32 was close behind it, also thanks to a fast compression speed and good compression rate.

Although WinRK was really good at compressing documents, its extremely slow compression speed made it the most inefficient compressor by far. It was almost twice as inefficient as WinAce, the next most inefficient compressor.



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