I am getting a 50 second server response time for a category page.
When processing, the following is shown in top:
4312 www-data 20 0 488280 146704 41816 R 99.7 1.8 1:11.54 php-fpm7.0
I have x-debug enabled with php7.0-fpm and nginx.
Developer mode is on and I am developing so I am not looking for a turn on production mode answer.
I am using magento 2.1.2.
I am also using a redis-server cache backend.
I am also on php 7.0.14 on ubuntu 16.04.
After enabling xdebug remote debugging and adding a breakpoint the average time to get a server response is a whopping 3 minutes. That is messed up.
I am using atom with the php-debug package for atom to debug.
I am also on an SSD, so read and writes should be fast right?
After running dstat -D hda these are the results:
Update: After disabling js merging and minification
After disabling js merging and minification as well as css merging server response improved to about 7 to 8 seconds. Thanks @Konstantin, it is now bearable.

xdebugworks quite well takes it down to 15 seconds, but then you can't debug – tread Oct 13 '17 at 13:54