Much faster and/or better compression/decompression of images (tunable of course, depending on what level you set in the code), and also faster startup of VMs.

Much faster and/or better compression/decompression of images (tunable of course, depending on what level you set in the code), and also faster startup of VMs. I haven't measured exactly. I'd guess ~30% in my case. But all this depends on where the bottleneck is in any particular case. My VMs are on HDD, so increased decompression speed doesn't matter that much, but reduced size helps reading the necessary data faster. Linux VMs seem to be more compressible than Windows ones. It's certainly better than zlib in any case.