Reborn has issues but the game is so good it is still great.
Haven't ran into any issue really, no slowdows, no bugs or glitches, anything. I am playing the Switch version, so maybe it's the PC version? I wouldn't be surprised if the PC version sucked ass because Square's PC ports are notoriously utter shit.
Edit: So i did some research and this version does have a bunch of changes.
- You no longer have skills points, instead characters learn the skills in specific levels. Most skills also no longer transfer between classes outside of the ones that share the same weapon type, i.e if two classes use spear both can use the spear skills (Valkyrie and Dragoon sharing Ruination spear skill). Only four skill slots which to me just means i actually have to think hard about which skills to use instead of just being able to pick everything.
- The buff cards are a new thing. I actually kind of like them because it means i can actually do something in turns where the only thing i can is walk. Plus it can make enemy units suddenly way more dangerous when they get a damage buff card.
- Crafting is 100% guarranteed instead of a chance of failing (i actually love this because i have been playing a MMO riddled with RNG bullshit upgrading, so i'm glad it doesn't fail here).
- There's a level cap which is increased between story battles, which i actually kind of like because it's so easy to overlevel in this type of game and it means the game has an actual level curve. Plus it makes story battles more challenging because enemies are always either in my level or above mine.
- Random encounters replaced with training. Which is basically the same thing, if not for the fact that training doesn't give you money and loot, which is dumb as shit.
- HP bloat is a thing and this is legit the thing i hate. I am around level 16 and i'm starting to notice enemies have way too much health. Plus apparently healing spells weren't scaled to the new hp numbers and it makes them less useful.
I haven't played the original or PSP versions though. If i had actually played them i probably would have been angry at some of these changes. But apparently each version has their differences, so i guess it's up to people which version they like.
I'm still having a blast with the story, characters and gameplay anyway.