For anyone wondering, I went to the cinema to watch it, and while I was able to follow and did enjoy it, it was incredibly frustrating not knowing what was being said for large portions of the film.
I regret watching it this way and wouldn't advise someone to go ahead in the same way.
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Are they speaking Mandarin or Cantonese in everything everywhere all at once?
Everything Everywhere All at OnceCountryUnited StatesLanguagesEnglish Mandarin Cantonese
Budget$25 millionBox office$86.8 million12 more rows
What language do they speak in everything everywhere all at once?
How common is Mandarin vs Cantonese?
There are an estimated 84 million  native Cantonese speakers in China (4.5% of China's population) compared with 933 million Mandarin first-language speakers (61.2% of people in China).
How mutually intelligible are Mandarin and Cantonese?
Despite both being tonal languages, they are not mutually intelligible
. This means that while Cantonese speakers would be able to decipher Mandarin writing, they would not be able to understand the spoken language, and vice versa.
Chinese Reacts to Everything Everywhere All At Once