Epson 400 - Manual (Page 106)

Increasing the Print Speed
Just as printing at a high resolution requires more processing
time, printing in color takes longer than printing in black
because the volume of data in a color document is much
greater. For this reason, it is important to be selective in your
use of color if you also require a faster print speed.
Even if your document requires the highest resolution and
extensive use of color, for example when printing a
camera-ready composite that includes color photographs, it
may still be possible to optimize the print speed by adjusting
other printing conditions. Keep in mind that changing some
conditions to increase the print speed may also lower print
quality.
The following table shows the factors that inversely affect print
speed and print quality (increasing one will decrease the other).
Print quality
Print speed Lower
Faster Higher
Slower
Printer driver settings
Print Quality Economy*, Normal - 360 dpi Fine - 720 dpi
High Speed On Off
Halftoning No Halftoning Error Diffusion
Data characteristics
Image size Small Large
Resolution Low High
*The Economy and Normal - 360 dpi settings print at about the same
speed. However, Economy saves ink and prints lower quality output.
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Hawaii2 Ref. Guide
Rev.b
A5 size Chapter 6
06-02-97 DR, pass 0
Troubleshooting 6-23