No. of Recommendations: 1
It's possible that the problem is all software related.

The OP tried doing a clean install on the drive ("erasing the disk beforehand"), and it was still slow. Also, I've installed Mojave on a 2012 15" MBP Retina (the one I brought in for repairs in another thread), and it wasn't that slow (though it was a BTO Core i7).

So, my conclusion is it's less likely a software problem and more likely a hard drive problem. Other possibilities include other hardware, e.g. RAM, firmware, etc. The Apple Hardware Test or Micromat's Techtool Pro will be able to help.

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