When I installed Apple[he]#039[/he]s MacOS Mojave, it slowed my formerly reliable MacBook Air to a crawl. My computer, released in 2015, has 4GB RAM, an i5 processor, and a Broadcom 4360 wireless card, but Mojave proved too much for my daily driver—it made working with GnuCash impossible, and it whetted my appetite to return to Linux. I am glad I did, but I felt bad that I had this perfectly good MacBook lying around unused.

Source: LXer – Give an old MacBook new life with Linux