Ensure you have a valid PS2 BIOS file, or the emulator won't launch your ROMs.
: You might notice a slightly longer initial load time as the emulator indexes the compressed data. Lower-End Devices
For those who may not be familiar, ROMs (Read-Only Memory) are essentially digital copies of games that can be played on devices other than their original console. In the case of PS2 ROMs, these are files that contain the data from PS2 game discs, which can be downloaded and played on compatible devices.