AetherSX2 is based on the PCSX2 core. Modern PS2 emulation is incredibly demanding; it requires a massive amount of computational power to translate the PS2's unique "Emotion Engine" architecture into something an Android phone can understand.
Emulating the PS2 is resource-intensive. For a "verified" smooth experience, your device should meet these specs:
AetherSX2 is a frontend emulator for the PlayStation 2 console, designed to allow users to play games they own on their Android devices.
If you only have an ARMv7a phone/tablet, stick to lighter emulators (PS1, N64, PSP). AetherSX2 on 32-bit is an interesting technical demo, not a daily driver.
It is free from malicious code or malware often hidden in unofficial, modded APKs.