I've observed that speed bumps slow them down - briefly - but dont solve the problem.
I installed 10" x 10" x 10' concrete blocks to stop the cut-thru speeders.
Theyve worked great for a long time (25 years). About once a month somebody drives over them anyway. Yes it often causes damage to the car, but only a few have tried to get me to pay for the damage.
I originally spiked them into the macadam with rebar, but every time somebody drove over it the rebar bent and it was a pain to get the block off the rebar, straighten the rebar, re-spike it in... so I got rid of the rebar. Now the problem is that the blocks sometimes get stuck under the car and moved. Which means I have to drag them back.
So yeah, nothing is easy.