Juli Clover, MacRumors:
The 2019 MacBook Air, refreshed last week, appears to have a slower SSD than the 2018 MacBook Air, according to testing by French site Consomac. Using testing with the Blackmagic Disk Speed benchmarking test, the site found that the read speeds of the new SSD are lower.
A test of the 2019 MacBook Air with 256GB of storage demonstrated write speeds of 1GB/s and read speeds of 1.3GB/s. An equivalent model released in 2018 featured write speeds of 920MB/s and read speeds of 2GB/s. While write speeds are on par with the older machine (and are even slightly better), read speeds have dropped 35 percent.
As far as compromises go, I think this is a pretty good one: very few people will notice this and, if it’s what allowed Apple to reduce prices, it’s beneficial to anyone who wants a larger internal drive and doesn’t want to remortgage their home.