In game it doesn't work, you save and then it simply reverts to YES. I set the option to NO in the config file and then made the file Read-Only. Didn't work... I use F3 for biome names and stuff and every time I press F3 I get a huge lag that doesn't completely disappear after I close the... what's it called again? Is there a way to disable the debug profiler from Optifine?