I like the game, but it's a hot mess. This is probably the worst optimized RPG Maker Game I've ever played. Be prepared for your system designed for tripple A games to tank while playing this. Developer probably wants to re-evaluate the mods or scripts they're using for the next game, because this is way too slow for most people. Considering this is a glorified PNG slideshow, this most certainly shouldn't be as demanding as it is. The animation are extremely slow to load, the in-game interacts are running at a grand total of 10 frames per second on a good scene. It's just too much for what is being offered here. Consider Renpie or something.
While I agree that he is pushing RPG Maker to the max and should definitely find better plugins, I personally don't encounter many issues. I have what would've been a top gaming PC 6 years ago, and I never have any stuttering or lag or delay from the "animations" loading. I generally only have 2 problems. When I first start up the game, it can take 30 secs to a min to actually get to the main menu. And randomly the game will just crash with no error message if I've been playing for atleast an hour. The crashing would be a major issue to me if it wasn't for the autosave.
But I do think he should find a plugin that actually uses the animations as a gif or video, as yeah they're stored as pngs for each frame. Go to the \www\img\Special_actionSeq\ folder if you want to see them in the game files. I would imagine this would fix alot of mid and lower end PCs issues, not having to essentially render it in real time. I know I've played RPG Maker games before with plenty of animated scenes and don't remember seeing people complain about them lagging, so it probably is just the plugin he's using.
I personally love the feel of RPG Maker-esque games that I haven't seen people be able to replicate in Unity or Ren'Py. Unless your goal is to make the game just a VN or a 'point and click', for small devs to give players that somewhat "sandbox" feel where they can roam around the map at their own pace, I do think RPG Maker (Wolf RPG is good too) is still the best. The one exception I'll give is RPG Maker VX Ace games, I hate trying to get those games to display properly on my 2k monitors.