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Here is another xinput suggestion found on stackexchange... xinput --set-prop 8 269 -0.5Where the 8 is the mouse id, 269 is the code for "libinput Accel Speed", and the -0.5 is telling it to go slower (I guess 0 is the baseline, so to slow it, you go below 0). If that's still too fast, you can try -0.6, -0.7, etc. To reset it, set it back to 0.0.