Why is usb speed so slow?

Question

USB

I don’t understand at all, all these statements regarding the high speed of usb 3.0 and newer, up to 40GB per second, which is simply ridiculous, because even on usb 3.0 the speed is at first several hundred megabytes, but eventually drops to tens of megabytes, and if there are many small files, then up to hundreds of kilobytes per second. Where did all these 40GB per second come from? Or is my speed so low?

Answer 1

Most likely you are confusing GB and Gb / s
Study Wikipedia carefully -> USB

Answer 2

This is your flash drive brake. You try Optane NVMe SSD via adapter. On Type C, it accelerates to gigabytes per second