Printing and scanning seems slow when using a wireless connection (router or access point)
Check the following:
Try moving the computer and printer closer to your wireless router or access point.
Don't place the computer, printer, or wireless access point near microwaves, cordless telephones, large metal objects like such as filing cabinets, or other sources of wireless interference.
If your wireless router or access point and the printer are located next to each other, you can try connecting them together with an Ethernet cable.
This is an alternative option and will help determine where the problem lies.
If printing or scanning still seems slow, the problem may be related to the computer's resources, the network, a conflict with Epson software, or settings in the printer and scanner drivers.
If the document to be printed/scanned is large and resolution settings are high, then there could be a speed difference between a direct USB connection and a Wireless connection - wireless may be slower.
There are a number of factors to consider such as size of document, wireless signal strength, other network activity, and wireless security settings also have a small effect.