Try changing these preferences in IBrowse. Open the Preferences, go to HTML, then Images. Copy these settings and see if it makes pages load any faster:
Use Fastmen for images: Yes
Play GIF animations: When window is active
Load images: All
Swap for JPEG decoder: "RAM:T/JPEGTMP/" or simply "JPEGTMP:" if you have it assigned to RAM:T/
Memory limit for JPEG decoder: Set this according to how much RAM you can spare. 2048K is my setting, but I have a slower Amiga.
Palette: Fast
Dithering: Off
Don't dither backgrounds: Yes
Progressive JPEGs: Yes
Use the Internal image decoding for all the image formats for now, and test the speed. If you have some good datatypes installed for JPEG, PNG, XBM and GIF, try the settings with External image decoding, and compare the speed. I'm still using AGA, so Internal Image Decoding is best for me, but it's possible your datatypes are faster than IBrowse, so try both settings.
There's not much else you can do to speed up the browsing experience other than going for a faster CPU. Try downloading some large files and see if the download speed is reasonable compared to the PC, then at least you'll know if the speed problem is network related or CPU related.
