What cultural faux pas should I try to avoid making in Montreux?

"In Montreux, Switzerland, it is considered rude to be late for appointments or meetings, as punctuality is highly valued in Swiss culture. It's also important to avoid discussing personal matters or asking personal questions in public, as the Swiss value their privacy. When dining, it's considered impolite to start eating before everyone has been served. It's also customary to say "bon appétit" before starting to eat. In Switzerland, it's considered a faux pas to litter or make a lot of noise in public places. This includes speaking loudly on your phone or playing loud music. The Swiss are known for their cleanliness and respect for the environment, so it's important to respect these values when visiting Montreux. It's also important to remember that Switzerland has four official languages: German, French, Italian, and Romansh. In Montreux, the primary language is French. While many people speak English, it's considered polite to at least attempt to speak the local language. Finally, tipping is not mandatory in Switzerland as service charge is included in the bill. However, it's common to round up the bill to the nearest franc as a small tip. Offering a large tip, however, can be seen as ostentatious and is generally not done," remarked another expat who made the move to Montreux , Switzerland.