The cursor is very slow on the students Chromebook

A quick solution might be to check their accessibility options.

You can find these settings (if they are turned on) by clicking the clock in the bottom right of the Chromebook screen.  With multiple settings turned on you may find the cursor lagging a little as it tries to enact all of it's new rules at once.  The biggest offender is having “LARGE MOUSE CURSOR” turned on.  

If turning this off doesn't help, click the “NEW TICKET” button in the top corner of this screen and we'll be over as soon as we can.