Fixed it. TCP Optimizer did the magic, may connection speed there was set to 14Mb and after changing it to 100Mb it goes fine.
Still I am still thinking about upgrading to win10, especially with the new BASH stuff.
Thanks to everyone for posts speeds and tips, it really helped me to workout where the problem was.
in that case, it sounds exactly as i pointed to. Your TCP window scaling settings were tinkered with and was causing issues.
Glad you fixed it, looking much better!