I’m not sure, but I think the 47.3M is the size of the RPM that you
download. However, that RPM is compressed. The 223M is the size after
uncompressing.
And, of course, the RPM contains many files that are associated with the
kernel and need to be updated when the kernel is updated.
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-opensuse Leap 42.1; KDE Plasma 5;
–opensuse tumbleweed; KDE Plasma 5 (test system);-