Talk:Fleeting Expertise/@comment-210.187.147.68-20151018122902/@comment-8256051-20151018124020

You can check the blog post I made to help you with that :

http://warframe.wikia.com/wiki/User_blog:Fegazeus/17.5_Duration_mods_and_drain

tl;dr : if you use Fleeting Expertise + Streamline, you'll get maximum efficiency as long as you keep the same ratio of efficiency and duration. You can then add Transient Fortitude as long as you counter the malus with any duration mod  above +27.5% duration.