The magic cure for tearing:
nvidia-settings -> x server display configuration -> advanced -> force composition pipeline
Magic comes at a cost of course. ;-]
Without “force composition pipeline”:
I observed that keeping applications on different desktops (workspaces) helps,
i.e. don’t have one window ontop of another.
Also, certain websites on other tabs could cause tearing,
i.e. keep tabs to a minimum.
For firefox it helped to turn off smooth scrolling. (preferences->advanced->smooth scrolling).
With “force composition pipeline”:
Chromium 64.0.3282.140 is having some performance issues (stuttering while scrolling).
qutebrowser v1.1.1 (6f028e9) doesn’t have performance issues, using (Py)Qt5.10 Webengine (Chromium 61.0.3163.140).
It seems that adding “force composition pipeline”
to /etc/X11/xorg.conf makes xfce hang on startup.
I can solve it by: ctrl+alt+f1 then ctrl+alt+f7
but maybe I’ll just enable it manually. >_<
This could be your graphic card issue. What nvidia card do you have.
I am using xfce w/ nvidia gtx 650 Ti kind of old card now but I am not having a tearing issue.
I use xfwm4 and sometimes kwin with one led monitor, one lcd monitor and one lcd tv.
Edit:
I am using kernel 4.14.14 and 390.25 nvidia driver.