Hey, I am also not a native English speaker. But when I speak in English I stutter less. I have no idea why. But I think it is due to the fact I focus more on the English language itself rather than my speech. Like which word should I use or how to correctly pronounce it etc.. Also, people tend to be more patient with me when I speak English. Probably they think that my language skills are poor, and I am struggling to find the words or make sense. But when it comes to my mother tongue, it is horrible. People gives me strange look, some laughs...