Sort of, the variation in color is a combination of read+write+read speed of a particular block. Because writing is happening the SLC cache comes into play, but it does not account for the very low average speed of 64.27MB/s of the drive (firecuda 520 is ~600MB/s sequential when the SLC cache is exhausted and everything is being written to TLC).
This was the post I was pulling from:
The other benchmarks on the post are actually 100% read speed, but they don’t correlate file size to read speed which would be an important metric to consider. Also once the speed test is done on the refreshed drive and it achieves the 2519MB/s average readspeed, the file dates become meaningless.