There is no performance issue with the file format, the parsing is not
noticeable.

There is a massive design problem in the DepCache having to visit every
dependency in the cache and do marking stuff. This worked fine for tiny
sets, but scales superlinear to package count.

That's a very long time effort thing to fix for a future ABI break, we
need to only check those dependencies we actually care about.

Out of those 0.5s, probably about .4s are spent checking dependencies.
This will decrease by factor 10-50 presumably.

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https://bugs.launchpad.net/bugs/1713219

Title:
  'apt-mark showauto' and 'apt show' is slow

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