How can I make this old Power Mac G4 better for gaming?

[sparklegrass]

How can I make this old Power Mac G4 better for gaming, nothing major like WOW but games like Runescape or Facebook games

Model Name: Power Mac G4
Model Identifier: PowerMac3,6
Processor Name: PowerPC G4 (3.3)
Processor Speed: 1.25 GHz
Number Of CPUs: 1
L2 Cache (per CPU): 256 KB
L3 Cache (per CPU): 1 MB
Memory: 1.5 GB
Bus Speed: 167 MHz
Boot ROM Version: 4.4.8f

 

[miles01110]

You can't, as one would expect when trying to use 7+ year-old hardware.