F7 button on epsxe 1.70

I understand that the f7 button switches to the secondary soft video plugin. What i dont understand is, in this f7 mode it runs faster, but even when i set the quality to nice, the graphics are extremely choppy and pixellated. My configuration for the soft video plugin isPlugin: P.E.Op.S. Soft Driver 1.1.18
Author: Pete Bernert and the P.E.Op.S. teamResolution/Color:
- 640x480 Window mode
Stretch mode: 0
Dither mode: 2Framerate:
- FPS limit: on
- Frame skipping: off
- FPS limit: AutoMisc:
- Scanlines: disabled
- Game fixes: off [00000000]Anyone can help me?

dont use the soft plugin if the game run properly with the main plugin...

i cant play properly without pressing the f7 button. i just want to know whats behind all these.

Adjust your graphics plugins to run "Fast". Don't use the soft plugin.For your main hardware plugin use a low resolution, like 640x480. Disable any graphics smoothing, all the options usually show info about them like "Faster, Slower, etc). Choose the "Fast" options, they require less work by your computer.