Why is the size of the saves "A Problem", as far as I can tell everybodies saves are around
6 to 7 MB in Fort Joy
10 to 12 MB in Reapers Coast
I fail to see why you'd ever consider save size increase as you progress, and inventory increases as any sort of problem.
Larian are aware of Long Loading time issues, but for most of us that's mod related.
Adding, or removing mods can vasly increase the first loading time, as the game needs to rebuild each time, and the bigger the size, and number of mods used, the longer it takes.
Whilst I'm not saying that's your issue, you should be aware of it.
As far as I can tell, this threads ignored, because it's mainly about the savefile sixe.
That's not a problem, or a bug, it's normal for this game, we all have the same sizes of saves.
If you do have other issues, post about those issues outside this thread, ignore the savefile size.
If you find a thread that's about your actual problem, post there, or start a new topic.
Make it about what your problem actually is, and you may get somewhere.