I'm using Ubuntu 16.04 on Dell Inspiron 5547 i7-4510U on SSD. While everything works fine on other laptops, this one is really slow. It takes around 15 seconds to lock screen, Firefox is slower than internet explorer, delayed mouse clicks, delayed actions, it takes 2 seconds to switch tab in Firefox, etc. I have no idea what's the problem, I couldn't find any drivers that could help, edited /etc/sysctl.conf :
vm.swappiness=10
vm.vfs_cache_pressure=50
but that doesn't work like i'd like to. I did clean install and it's still the same.
