I would have been happy with full stops, commas and line breaks...
But I get where you come from.
The bigger file size is more likely not the problem, my suspicion lies more in the general hardware requirements. In my opinion are engines like Unity, UR or other crap inferior to renpy - for a AVN.
I haven't played the former versions of the game, so I can't really compare the hardware hunger between 0.3 and 0.4, but it's possible that with the overhaul/rework(?) of the game the hardware requirements have risen. And that could be a problem with players that have *only* a potato pc - no offense.
At least from my point of view, with my setup ( Win10, 12GB RAMI have not this kind of problems you have described.
Im on windows 10, 32 GB of ram, a 12 core processor, So not so much a potato settup and mine would crash and freeze. Maybe i was just unlucky? Its hard to say but from what iv seen on a few platforms, im not the only one so its hard to say. When i mentioned the file size, I was mostly stating the fact that the game some how triples in size, but yet we get maybe a tenth of extra content (to what is currently in the game). I also dont believe the file size contributes to it being unstable.
Edit: Just to iterate a bit more. Only thing in my settup that could be classed as "old" or "potato", would be my GPU but if it was a hardware issue (Running out of ram, CPU overload, or GPU overload), then it would also be reflected in my hardware monitor that is up at all times on my second monitor. But yea my post is mostly to inform anyone who thought as I did, that if they are expecting a bunch of extra content because the game exploded in size, that they should not expect that as again, all thats really new is the new "intro" , as well as a new mission with Jess (Jester) , and the pink haired girl and thats basically it. If we were to cut out chapter 0 , there is maybe 20-30 minutes of extra content id say.