Hi, I was experimenting a little with optimized zlib versions (like zlib-ng) to optimize the speed of compressed qcow2 generation.
I found out that chaning the windowBits from -12 to -15 alone increases compression speed by about 15% while lowering the compressed size by about 6%. As a test case I used a Debian 8.1 disk image. What is your opinion in chaning the windowBits? The cost is a higher memory usage. The usage changes from 272k -> 384k for compression and from 4k -> 32k for decompression. Peter
