Not stable on VGA 6600XT

I have 2 computers; 1 runs an Intel CPU with a GTX 1650 VGA. Although the frame rate is not high, it is quite stable. The other system utilizes an AMD CPU equipped with a VGA 6600XT. On certain maps, the game runs smoothly, but on others, such as Trial of Chaos, it becomes extremely lag and nearly unplayable, even when I adjust the settings to the lowest possible level. Typically, I set the settings to a high level, but it still functions well.