Mikuro
Crotchety UI Nitpicker
The G3 is actually much faster MHz-for-MHz than the PII. For things like video processing, where the Pentium's MMX helps a lot, they're about even. Check the system requirements for Divx or anything like that, and you'll see the clock speeds they recommend are about the same.
I should think any 700MHz system would play it fine. Certainly a 700MHz G3 would. But a G4 would definitely serve you much better, even at lower clock speeds.
Another thing to keep in mind is that just about everything about your system is slow. Slow system bus, slow graphics card, etc. The bus speed can make a big difference for these things. Personally, I wouldn't want to sink too much money into upgrading. For the money it would take to upgrade, take a look at eBay and see what you can get used.
I should think any 700MHz system would play it fine. Certainly a 700MHz G3 would. But a G4 would definitely serve you much better, even at lower clock speeds.
Another thing to keep in mind is that just about everything about your system is slow. Slow system bus, slow graphics card, etc. The bus speed can make a big difference for these things. Personally, I wouldn't want to sink too much money into upgrading. For the money it would take to upgrade, take a look at eBay and see what you can get used.