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2.2 GHz (Turbo Boost up to 3.4 GHz), 2.5 GHz (Turbo Boost up to 3.7 GHz), or 2.8 GHz (Turbo Boost up to 4.0 GHz) quad-core Intel Core i7 processor with 6 MB shared L3 cache.

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MacBook Pro EXTREMELY slow after Upper Case Assembly replacement

I just replaced my whole upper case on my MacBook and it has been unbearably slow ever since.

I made sure I followed the guide properly and I also cleaned out and reapplied my thermal compound for my CPU. I also mounted the heatsink tightly so it has enough pressure.

I have tried doing a clean install of macOS (full drive wipe), resetting the NVRAM, PRAM, and SMC but there's still a lot of lag constantly.

There would be around 8-10 seconds of lag between keystrokes or starting Safari.

GeekBench 4 results for my CPU are: 415 Single core and 1396 multi core, which is way less than the average according to the comparison chart.

Third-party softwares are telling my that my battery health is at 97% and that my temps for CPU and all other internal components are below 34 degrees Celsius.

What could it be?

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Double check you trackpad cable that runs along the top of the battery. If it's not connected properly or damaged it will make your computer run like crap.

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Let us know how it reacts to running in Safe Mode. Boot up holding down the Shift key.

What Mac OS X are you running? How free space do you have on your storage drive?

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David Chun will be eternally grateful.
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