Workaround:
1. sudo apt install xserver-xorg-input-synaptics
2. Log out
3. On the login screen select session "Ubuntu on Xorg"
4. After logging in, disable hysteresis:
synclient HorizHysteresis=0 VertHysteresis=0
This won't cure laggy hardware but it will at least eliminate the
software lag in touchpad response.
Next, since you're now using Xorg and not Wayland, you likely are also
using the Intel graphics driver for Xorg. The intel xorg graphics driver
is also laggier than Wayland by default (by one frame or ~16.6ms). You
can fix that by creating a /etc/X11/xorg.conf with:
Section "Device"
Identifier "MyLaptop"
Driver "intel"
Option "TripleBuffer" "off"
EndSection
Although this does risk hurting the framerate smoothness of gnome-shell
while it is still relatively young and un-optimized, you can choose
between smoother graphics ("TripleBuffer" "on") or lower latency
("TripleBuffer" "off").
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https://bugs.launchpad.net/bugs/1696929
Title:
Touchpads are unresponsive and laggy
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