Daniele,
I browsed for quite a while using an A1200/060 AGA only. I will say that it was much less painful with an 060 card with plenty of memory, however it was nowhere near as fast as my 2000/040 with CV64-3d card. For many Web graphics it is still true that 256 colors gives a reasonable output, and you can use monitor modes to give 800x600 which is generally adequate. A flicker fixing box is also helpful. And the 060 helps with all other tasks as well.
For graphics where viewing the quality is most important, you can download the graphic and view it in a separate window with Superview or other higher quality renderer, which can use higher color modes.
The major headache was that the browser was not up to modern Web pages; even eBay with its _huge_ javascript pages was painfully slow. For that site I would disable javascript for most pages and only enable it when I needed to bid / pay for something. IBrowse was my choice at the time, 2.3 version I think.
