Also, check if there's any recent patches or updates in the emulation scene that affect CHD usage on PS2. For example, PCSX2's handling of CHD files, or maybe a new emulator that's beta testing but shows better performance with CHD.
I should also check if there's a recent update in the community. For example, maybe there's a new way to backup PS2 games into CHD format without needing the physical disc, or an updated tool to convert backups to CHD efficiently. Alternatively, a firmware update might affect compatibility with CHD files, but that's more likely for the hardware, so maybe not. ps2 chd roms upd
Legal note: Emulation and using CHD ROMs of games you own is legal in many cases, but redistribution is not. The user should only convert games they own. I should mention that. Also, check if there's any recent patches or