Final Fantasy Tactics: The War of the Lions

[Larkas]

Hey guys, do you know of any hacks that can be used to make the game run smoothly with some kind of upscaling going? I'm trying Hybrid + Bicubic, but Hybrid, Bicubic and xBRZ have the same problem: the game slows down to almost a halt every time a character is to take any action, or when a thunder strikes before the first battle. Mind, this is not the regular slowdown experienced in the game (I've solved that already), it is a slowdown experienced only when I select any kind of upscaling. When running the game with upscaling turned off, it runs very smoothly. Any ideas?