As indicated above there are many factors that affect read/write speed to a My Cloud.
230mbps (Megabits) is approximately 28.75 MBps (Megabytes). The better way to test is to use a hard drive testing program like Crystal Disk Mark (http://crystalmark.info/software/CrystalDiskMark/index-e.html) and run several tests.
See the following thread where others have posted some results of their tests with CrystalDiskMark with several My Cloud devices.
https://community.wd.com/t/new-release-firmware-release-04-04-02-105-1-27-2016/148441/89
https://community.wd.com/t/performance-benchmark-results/151741
For the My Cloud that I use, with a replaced hard drive (Seagate 1T) here are my results from a Gigabit wired PC (older Asus motherboard with a 64GB SSD hard drive). Note that the My Cloud unit I use initially came with a 4T WD Red 5400 RPM Class SATA 6 Gb/s 64MB hard drive that got damaged, and was replaced with a Seagate Barracuda 1TB 7200 RPM 32MB Cache SATA 3.0Gb/s hard drive.
Edit to add: And to show how network speed is a factor, here is the results from a laptop with a wired 100MBps connecton to the My Cloud.
