How to fix slow trackpad: OSX 10.12.2 I just installed the latest patch for Sierra, so am now on 10.12.2. Post-upgrade my pointer controlled through trackpad runs very slow when I open the laptop. I can fix it by opening System Preferences -> Trackpad -> Point &amp; Click, and just moving the "Tracking speed" slider a notch and then back to where I want it. But the fix doesn't seem to persist, so I have to do this every time I wake the machine. Does anyone know how to fix the issue permanently?

Update: using a mouse works fine regardless of trackpad state. Further, opening a full-screen application resets the trackpad back to being slow, so it's not just when the computer goes to sleep :(
I would try resetting both the SMC and PRAM/NVRAM.

SMC

The instructions for resetting the System Management Controller (SMC) will differ depending on whether your computer:


runs from a built-in battery?
runs from a removable battery? 
can only run from power off a wall socket?


Since you haven't specified your computer I will provide the instructions for all three possibilities.

For MacBook Pros, MacBook Airs, and MacBooks where you can’t remove the battery on your own (i.e. it's a built-in battery), here’s what you do:


Shut down your computer
Keep the MagSafe adapter (or power cable) plugged in.
Press at the same time shiftoptioncontrol (on the left side of the keyboard) and the power button
Let go
Turn your computer back on with the power button.


For MacBook Pros, MacBooks etc that you can remove the battery from, here’s what you do:


Shut down your computer
Disconnect the MagSafe plug (power cable) from the computer
Remove the battery
Press the power button for 5 seconds and release
Put the battery back in
Reconnect the MagSafe cord (or power cable)
Turn your computer back on with the power button


For iMacs, Mac Pros, Mac Minis, etc that only run from a power point in the wall


Shut down your computer
Unplug it from power
Press and hold the power button for 5 seconds
Plug it back in and turn it on.


PRAM/NVRAM

Older Macs had what's called Parameter RAM (PRAM), newer Macs use Non-Volatile Random-Access Memory (NVRAM). Regardless of what Mac you have, the instructions for resetting this are as follows:


Shut down your machine. Yes, a full shut down, not just logging out.
Press the power button and then press the commandoptionpr keys. You have to make sure you press these keys before the gray screen appears or it won’t work.
Hold those keys down until your Mac reboots again and you here the startup chime.
Let go of the keys and let your Mac reboot normally.


Note: When you log back in you may need to readjust some of your system preferences (e.g. mouse speed, time and date/timezone, etc).