Serhii NazarovetsTatsuya Amano and colleagues surveyed nearly a thousand environmental researchers from different countries and compared the amount of effort they put into conducting their research in English:
https://doi.org/10.1371/journal.pbio.3002184
As expected, it turned out that non-native English speakers, especially at the beginning of their careers, spend significantly more effort than native English speakers.
The manifold costs of being a non-native English speaker in science
This study reveals that non-native English speakers, especially early in their careers, spend more effort than native English speakers in conducting scientific activities, from reading and writing papers and preparing presentations in English, to disseminating research in multiple languages.