Hi,
Theres no real 'tricks' behind improved speed & GFX as such.
A nippy (ish) processor, probably an 030, & a GFX card should set you of nicely. The overheads for your Amiga are quite low, so a little upgrade makes quite a difference.
However, if hardware upgrades are out of the question. One suggestion (Although not very pretty) could be to disable the loading of images (So you can still read the content) & when you get to a website you need to see, you can right click images to load individual ones or simply press the "Load Images" button in the tool bar to load on the page (If you don't have a "LoadImages" button, youo can put one in using the Preferences/Settings/GUI/Toolbar options page.)
FuZion.