If you change some settings in Advanced settings dialog, it is triggered the recipe parsing. There is no need for this in some cases, and if it's needed I suggest to move them back in Settings, so you don't have to wait Recipe parsing to set some settings. Paul, can you help us to say which settings do not need reparsing? Thank you!
After a more detailed analysis, I saw that there is no setting that can avoid reparsing. In the same time, all need the first parsing, in order to corect populate the dialog for advanced settings. I will close this bug with the status not a bug.
verified not a bug