Even thought I’m fluent in english, I read noticably faster in swedish, which is my native tongue. I watch mostly historical c-dramas. Two things I’ve noticed here on viki are: The chinese speak very fast, faster than I can read english subs 
That is because the subs disappear when they stop talking, even if there is noone answering and the subs could have stayed for a second or two longer. Some subbers are kind and explain things that otherwise would have been lost in translation and then you really need to hurry to keep up.
I usually don’t look for swedish subs because there usually insn’t any and even if there were, translating yet again and there would be even more that’s lost in translation.