This is not just an accent, it’s extremely poor speaking and comprehension of English itself. Communication is painfully slow and you have to change the way you talk and your vocabulary as well.

After a week of that, interviewing someone who actually knows English feels like turbo charged discussion. I get through interview questions in half the time, with literally 10x more information communicated.

Those are two different things, yet you only considered one of those important enough to highlight in your original message.