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The compressed loopback device or cloop is a module for the Linux kernel. This makes cloop access very slow when there are many small scattered reads, which can happen if the system. — “cloop - Wikipedia, the free encyclopedia”, en.wikipedia.org
The cloop kernel module only allows one compressed image at a time to be active. The article says "The design of the cloop driver requires that compressed blocks be read whole from disk. — “Talk:Cloop - Wikipedia, the free encyclopedia”, en.wikipedia.org
qcow is a type of disk image that can be used with the QEMU emulator, the other disc image format types being vvfat, vpc, bochs, dmg, cloop, vmdk, cow, and raw, depending on the OS. The qcow image grows as data is added, and supports AES encryption or transparent decompression. — “qcow - Wikipedia, the free encyclopedia”, en.wikipedia.org