This release introduces a new feature for Inferno 2 ISO Driver that will simulate UMD read speeds for games that require it.
For most games this means nothing and performance won't be affected, but there are some very obscure games like Aces of War (#374) or the infamous DJMAX games (#124) where they check for reading speeds and introduce intentional malfunctions if it detects that the speed is faster than a real UMD.
The patch is applied only when these games are detected, so other games are unaffected (they get maximum read speeds as always).
There's also fixes for bugs introduced in r166.