Som svar til David.

"What is a good SSD write speed?
An average read speed would be about 500MB and an average write about 300MB/s (at least) for almost any SATA III SSD today . Fastest SSD SATA III is Samsung 860 Pro with 560MB/s READ and 530MB/s WRITE. Random Read is 100K IOPS and 90K IOPS Write. Best Sequential READ/WRITE in a SSD PCIe NVMe is 3700/s."

300MB/s er ikke teoretisk, det er praktisk, min ligger også deromkring.

Måske skal du have kigget på din computer :)