1. To access the image quality settings of the accelerator you need to right click on the accelerator icon in your taskbar and left click on settings.
2. The first tab that will display is the "Image Quality" settings. You can change the amount of acceleration that is being used by moving the slide bar from left to right. If you notice when you move the bar to the left, you can see the picture quality reduce (shown by the picture above the slider) and the acceleration increase. This means that the pictures that display will look slightly worse but your acceleration will be greater. If you move the slider farther to the right, you are increasing image quality and decreasing acceleration.
You can try to move this slider around to see if you can get a good setting that you are comfortable with.
* Some items on the Internet may not be accelerated due to type of content.