Benjamin Mayo for 9to5Mac (from Consomac):
As tested by Consomac using Blackmagic Disk Speed Test, 2019 MacBook Air can achieve reading speeds of 1.3 GB / s read and 1 GB / s.
The corresponding 256 GB SSD 2018 MacBook Air can have a speed of 2 GB / s and about 0.9 GB / s of write speeds.
Therefore, the new SSD component used has marginally superior write speed, but 35% slower speeds, falling from 2 GB / s to 1.3 GB / s. (The 128 GB SSD option has a lower rate of 0, 5 GB / s, but this rejection was also observed in 128 GB 2018 Air.)
MacDailyNews Take: Win Some, Lose Something …