Any fps boost?

[Urishk]

Hi, i downloaded Battlefield 2 some days ago, i have a i3 10110U, 8gb ram and no dedicated video card, only the UHD graphics. Bf2 runs pretty well, with a hight performance power plan without intel turbo boost (bc the cpu goes up to 90:/ ) goes up to 100fps with ALL settings to maximum.
I decided that i want a more technical game so i serached for some old game engine sims and i found PR, an original modification of the old engine of Battlefield2, i thought that it was gonna to run well, at least 60fps, but what i encountred is that with ALL settings to low the game runs at innestable 30 fps, i think that the problem are the maps are more recent and that causes the low fps. Its strange bc the game seems to be well optimized and the lighting, models and textures are not even from a 2010 game.
Also it seems to be rendering thinks that i dont see bc its impossible that maps with that models and textures run 30fps, when in bf2 with so much more quality textures and modeling(graphics in high) goes up to +100fps
Sorry for my bad english and if someone thinks that can help me, would be great
Also dont type the npc response saying that i have to buy a better laptop, there are people who can't afford it.