Unfortunately, Anonymous' answer is wrong. The write speed is 10 MByte/s (according to Digitec's specifications and also in my practical test when copying films). That is four times slower than would be possible with USB 2.0. USB 2.0 specifies a write speed of 60 MByte/sec, of which a maximum of 40 MByte/sec is achieved in practice. So this stick is really very slow when writing - don't be fooled by the fact that it is a USB 3.0 stick.

According to Sandisk:
"Write speed to the drive up to 15 times faster than standard USB 2.0 drives (4 MB/s); up to 150 MB/s read speed. USB 3.0 port is required. Data based on in-house testing; performance may be lower depending on host device. 1 MB=1,000,000 bytes" (https://www.sandisk.de/home...).
So up to 60 MB/s.