EPSON WF-3640 Series takes long to respond to print jobs?

Since the moment I installed this printer, it takes a long time to respond to print jobs from my laptop. It is connected through Wi-Fi.

Other functions, such as copying, goes well.

When I print something from my Iphone, it goes very quick. However, if I print something from my Macbook Air, it takes about 10 minutes to print.

What to do?

You could try connecting it directly with an Ethernet cord. I bet that would make it faster

Are you printing exactly the same thing? For example, most photos on a phone are low resolution, so they print faster than a picture that's 300 pixels per inch. Test like this:
- Take a screen shot (command shift 3).
- Copy it to the phone in iTunes > Photos.
- Print the picture from both the Mac and the phone.

If it is now about the same time to print, it's just that you were printing two different things before.

Do you have another computer you can use to test? It sounds like perhaps your print spooler (an area on disc which holds the job) may be corrupted. If you tried another computer you can see if the issue is the specific laptop or the Wi-Fi communication. Here is an article on general Epson printing issues which could be useful in the future.
http://www.ccs-digital.com/solving-Epson-cartridge-problems.asp