The Legend of Heroes: Trails in the Sky SC

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Most game runs pretty decent on my phone at 30FPS. But sometimes, PPSSPP lags.

Redmi Note 4X processor is Octa core Snapdragon 625, with Adreno 506, so it doesn't usually lags on any game.

I tried to play Trails in the Sky SC and I got pretty nice and stable 30 FPS on everywhere. Except when pressing pause that the FPS decreased to 15 FPS, and sometimes when loading other location also can slow down to 7 FPS. I tried to poke with the JIT thingy and now I think it's fixed, can run stable 30 FPS as usual again.

I also tried to set all settings one by one on Harvest Moon Boy and Girl. It really lags on outdoor scene, but smooth on Indoor scene.

Indoor Scene
   

Outdoor Scene
   

Could it be because Decoded and Invalidated textures ? As I say, I tried to set all settings one by one including by disabling Alpha test or thingy like that but still lag.

My PPSSPP settings is default settings.

Any help on that ?