Unfortunately the speed of scanning is inherent to the equipment. With is came a driver which will interconnect the all-in-one to the pc called TWAIN
Whilst there is a lot of software which can manipulate the scanned image, none of it replaces the TWAIN driver.
The best you can do is look for updated drivers on the manufacturer's website.
What I would suggest is that you look at the scanning resolution you use. The greater the resolution, the slower the scan. There is little point in scanning to high resolution - printed pages 100dti, photographs 300dpi are reasonable guidelines.