I wish you’d included the full meminfo output (namely, the “anonymous” entries), but:
“Cached” and “Buffers” hold data and/or programs in memory, so they don’t have to be pulled from the far-slower flash memory, and most of that can be reclaimed if necessary. Not only that, inactive processes will have their memory reclaimed, and paged back in if they’re needed. Not only that, many programs link to shared libraries, which (depending on the tool) “contribute” to the size of a program, but they’re really only in memory one time, whether one program is using it, or 20.
As I’d said before, you have plenty of memory left over for anything reasonable you’d like to do with this box, stop worrying about it.
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