The scanning speed may slow down depending on the scanning conditions, such as high resolution, image adjustment features, file format, and so on.
Computers with USB 3.0 (SuperSpeed) or USB 2.0 (Hi-Speed) ports can scan faster than those with USB 1.1 ports. If you are using a USB 3.0 or USB 2.0 port with the scanner, make sure it meets the system requirements.
When using security software, exclude the TWAIN.log file from monitoring, or set the TWAIN.log as a read-only file. For more information on your security software’s functions, see the help and so on supplied with the software. The TWAIN.log file is saved in the following locations.
C:\Users\(user name)\AppData\Local\Temp