When I compress files with compression level 1, it has everytime the same filesize and duration as when I compress it with compression level 3. It looks like there is no difference between those compression levels.
I double checked it and I have to correct it the level 1 compression have a lower file size as 3, you can see the compression results with the size in the attached screenshoot.
I checked it now 3 times in a row and used the windows context menu to compress the files.
For the methode Deflate and Deflate64 the file sizes are the same, the other methods has a different size and the size is smaller for the higher compression level. I attach the test results in a text file.
ok, for my purpose I need it faster. So I tested a bit more and found a solution for me to get this done. I will lower the word size from 32 to 8 and this will speed up Deflate from 14 sec to 10 sec to compress the file with 760858 KB. The file size after compress will be a bit bigger 5 MB, that's really nothing when I see the speed difference.
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I double checked it and I have to correct it the level 1 compression have a lower file size as 3, you can see the compression results with the size in the attached screenshoot.
Check it again.
And write the question again based on new results.
Also write about archive sizes in text format instead of screenshots.
Last edit: Igor Pavlov 2024-08-05
I checked it now 3 times in a row and used the windows context menu to compress the files.
For the methode Deflate and Deflate64 the file sizes are the same, the other methods has a different size and the size is smaller for the higher compression level. I attach the test results in a text file.
I did another Test with another file and the test results looks the same. I attach the result, this time only one test round.
Deflate method always uses small dictionary.
So we use fast and fastest for same settings.
We can change dictionary size for another methods.
ok, for my purpose I need it faster. So I tested a bit more and found a solution for me to get this done. I will lower the word size from 32 to 8 and this will speed up Deflate from 14 sec to 10 sec to compress the file with 760858 KB. The file size after compress will be a bit bigger 5 MB, that's really nothing when I see the speed difference.