Such shape of above USB drives are always performance really doomed as my experience. I bought it for using OTG backup for my Chinese friends without any expect of high perf.
Here I tested this little drive with CrystalDiskMArk 5.1.0 64bit in USB2.0 and 3.0 port (all same because this drive is not USB3.0). Sequencial writing speed is 10~13MB/sec. Yes, it also doomed. Horrible performance is just OK for 16GB. No more capacity will kill me for waiting write be done for big files.
I don’t recommend any small USB drive without Sandisk USB3.0. Sandisk improved their TLC flash drive performance with SSD controller with maximum speed as like old SSD series. I wanna say to stop making this sh*t likes…