xcompmgr is very slow and performs much worse than the Xfce4 default compositor (it tears sometimes and is orders of magnitude slower).
When moving mouse pointer it often freezes and then snaps to where it should be.
If you enable Xfce compositor xcompmgr still runs as it’s executed from the .xinitrc file so it starts first?
Why not just use the the xfwm compositor?
That’s on laptops with intel atom, celeron N2830 / n4200 CPUs. I expect same to happen on my workstation which intentionally has low end gpu (gt210 or worse).
I’m aware that I can disable it easily (put only 'exec startxfce4 in .xinitrc). Most don’t even know that .xinitrc or .xprofile exist. Just asking for more sane defaults.