How about Rollercoaster Tycoon and the open source remake, OpenRCT?
The open source version is more portable, more stable, more performant, and provides a great many more features and extensions compared to the original game. It is the way to play it today.
In the same vein, OpenTTD is just brilliant.
Not technically a remaster, but mods for Minecraft that drastically affect performance but not gameplay have been a thing for quite a while
Skyrim Special Edition - Huge improvement to frame rates and memory handling.
It’s blizzard, but the diablo 2 remaster runs so much better than the original which was resolution locked to 800x600 and 15fps, they could have kept the same graphics and that would have been enough of an upgrade
The Brood War remaster was actually pretty good, too. It was the last Blizzard product I bought.
Remasters are often cheap upscaling, so idk. Usually if they put enough work into a game, they call it a full remake. If you’re using the same hardware for a game from the 00s that was remastered a couple years ago, you’re going to need different hardware. A remaster is usually done to exploit new hardware capabilities.
That being said, maybe Shadow of the Colossus or Okami
That guy that’s remastering Mario 64 in 60 fps. Kaze emanuar or something
Yeah, what a legend. Dude knows the N64’s hardware better than any other person on earth
Bus goes vroom vroom
Openmw is a cımmunity made open source engine replacement for morrowind, it does run better on modern hardware
Not exactly a fair answer but Red Dead Redemption 1 remastered runs a lot better (60fps) on PS5 than playing the PS3 version via PSN streaming