Canon BJC-6200 - Manual (Page 251)

251 Troubleshooting - Other scanner problems
Scanning is too slow
Scanning is requiring an unusually long time.
Check Are you using a higher resolution than required?
In order to scan an image, your computer must be able to receive a large
amount of data. Therefore, the scanning speed varies according to the per-
formance of the computer.
To shorten the time required for scanning:
• Use the appropriate resolution setting. Make sure that the resolution is
not set higher than you require.
• Use the Prescanning feature to confirm and specify only a portion of the
entire image before you scan.