[G4] New Video Card, Processor, both, neither?

[Steve]

Over the years, I've added to my G4 (see below).  It's mostly used by my 6
year old now.  Although DVD's play well, some web-based video games and
flash content are painfully slow.  Would a new video card be worthwhile?  Or
would it have to be combined with an upgraded processor to see any
significant improvements?
 
Thanks,
 
Steve
 
Machine Model:    Power Mac G4 (AGP graphics)
CPU Type:    PowerPC G4  (2.6)
Number Of CPUs:    1
CPU Speed:    450 MHz
L2 Cache (per CPU):    1 MB
Memory:    1.12 GB
ATY,Rage128
Bus:    AGP
Slot:    SLOT-A
VRAM (Total):    16 MB
Bus Speed:    100 MHz
Boot ROM Version:    4.2.8f1
 
Capacity:    19.12 GB
  Model:    WDC WD205BA

 Capacity:    111.79 GB
  Model:    WDC WD1200JB-00CRA1
 
Capacity:    7.68 GB
  Manufacturer:    PIONEER
  Model:    PIONEER DVD-RW DVR-106D
  Revision:    1.07
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