Instead of storing all opinions in unique <Opinion1>, <Opinion2>, ... <Opinion254> tags for all profiles, only opinions with a value other than 0 is now stored in <AnOpinion id = "1" modifier = "-10" /> tag
This change changed the loading time for merc opinions from 4.047 s to 0.011 s
A small cmd utility tool for converting existing MercOpinions.xml data into the new format is available at https://github.com/Asdow/JA2-ConvertXMLData/tree/master