WP Super Cache with Qtranslate (multiple languages)

Good afternoon guys.

I have a wordpress site with these plugins:
– qtranslate
– qtranslate slug
– wp super cache

But I have this problem:

The default language version and its subsections runs great, but when I access to another language like: mydomain.com/?lang=ko and its subsections the website takes more time to load than the default language version.

My problem is when I checked “Wp super cache contents” the default languages contents are correctly created but the 2nd language contents are incorrect:

For example one post has this address: korean-prog/my-talking-tom-red-alert/?lang=ko but when I go to “Wp super cache contents” I find one “Fresh super cache file” with this address: korean-prog/my-talking-tom-red-alert/ (without the ?lang=ko). I think that is the problem which causes wp super cache it’s not working for second languages.

Any suggestion?

Thank you so much!

https://wordpress.org/plugins/wp-super-cache/