In order to check speed of your flash drive we recommend you to please use below software to make a general assessment of your testing.
• To download the software, please refer to below link:
Mac: BlackMagic utility
• Run the file and Install the software by following the installation wizard.
• Once the software is installed, please locate the “CrystalDiskMark Application” icon on the desktop
• Double click the icon and then select the SanDisk flash drive in the Device box.
• Run the speed check read & write speed.
• Once this process will complete, share screenshot of test results with us on email@example.com
Hope it helps!!