How can I get rid of mouse lag under Ubuntu?

I found this solution! Credit goes to the original poster.

https://superuser.com/questions/528727/how-do-i-solve-periodic-mouse-lag-on-linux-mint-mate

To save some peeps the trouble of going to the link here are the specific instructions I followed (copy and paste each line on a terminal):

sudo su -
modprobe drm_kms_helper
echo N> /sys/module/drm_kms_helper/parameters/poll
echo "drm_kms_helper" >> /etc/modprobe.d/local.conf
echo 'drm_kms_helper' >> /etc/modules-load.d/local.conf
echo "options drm_kms_helper poll=N" >> /etc/modprobe.d/local.conf

One thing worth checking is whether the the mouse is connected to a USB hub that has other devices connected. In my case, my Bluetooth mouse shares a USB hub with an Ethernet adapter.

The solution was to simply move the mouse to a different USB port.

I tried above commands did not work. I was also having my mouse pointer real slow all of sudden in properly working Ubuntu 18.04. Googled like crazy for about an hour, tried restarting for few times, checked RAM and CPU usage it was not even half, try unplugging the mouse for couple of times, went through the mouse settings,

Finally, found out the Zoom was switched on. Switched it off and worked like a charm.

The option can be found in Settings > Universal access.

Just use a USB 2.0 Port instead of a USB 3.0.