You might want an explanation of the "deep" technical features that make modern PSX compression (like Zstd in CHD) more reliable than older methods. Assuming you are looking for a technical feature concept
If you use DuckStation, enable "Advanced -> Replace CD-ROM reads with file seeks." This significantly speeds up loading times for highly compressed ROMs. psx highly compressed roms fixed
Best for PPSSPP, mobile emulators, and older handheld emulation consoles. How to Convert and Fix Your Own PSX ROMs Losslessly You might want an explanation of the "deep"