Macbook Pro Insanelly slow after keyboard replacement

What EXACT model/year MBP do you have?

Two possibilities:

1) Bad/incompatible keyboard

or more likely:

2) "The keyboard got watered, eventually the computer did not even turn off."

How long ago did this happen? So when the "keyboard got watered," more than likely the logic board was also involved. It just took a while for symptoms to show up.

Here's my standard "liquid spill response":

"Whenever a liquid spill occurs the first thing that has to happen is the laptop should be shut down immediately. All power must be removed as soon as possible. It is especially important that the battery be disconnected and removed.

All affected parts must be removed from the laptop. No attempt should be made to start/restart the computer since this could potentially damage the logic board beyond all repair.

Then all affected parts would be washed in deionized water and blown dry with compressed air. (In a water spill the deionized water is probably not as critical. Depends on the mineral content of the water.).

This is especially true of the large chips on the logic board. Liquid can wick under them and cause havoc for weeks if not months after the incident.

The logic board should be placed in a drying/dehumidifing oven for at least two days. Longer depending on the spill.

The keyboard is a separate matter

"

The best place for hardware diagnosis is an Apple store genius bar. If you do not have one near by, run an Apple hardware Test:

https://support.apple.com/en-us/HT201257

Note an error free AHT is not definitive.

Also boot into the recovery partition and run Disk Utility>First Aid (select Disk utility from the 4 option menu).

Ciao.

I just replaced mine and had the same issue. It would technically boot and go into OSX and the keyboard and mouse would function but the system was running the fan and incredibly slow. It took about five minutes to launch the terminal and check diagnostics. What I found to be the issue was a fault connection from the cable from the keyboard and touch pad assembly. I reseated them correctly and everything was fine after that.

If you have this issue, I would check your connections and ensure that you haven't crimped one of the ribbon cables, it's quite easy to do.

" What I found to be the issue was a fault connection from the cable from the keyboard and touch pad assembly. "

That ribbon connector is VERY HARD to connect properly. I use 3M Blue tape adhered to the outside as a "grabber" pull the cable into position.