If you mean the ugly dither pattern in pictures, then yes, you need a graphics card which will display in 16 or 24 bit and eliminate the dither. And be a lot faster too.
But if you mean web pages not loading properly...your problem might be that none of the Amiga browsers properly support any modern web standards, one of which is CSS, the lack of which really breaks some webpages and results in graphics all over the place.
