Thanks for the replies, Michel.
I've only recently upgraded (from Defunct to Vintage) from G4 to the G5 and started with a clean sheet so I'm pretty sure it's not stuffed up with junk.
However, I was advised on here that I would be able to use iMovie with 4Gb memory but it seems to me that more will be needed for a proper job.
It's not too bad for everyday stuff but I can't see it being up to heavy graphics/moving images.
I am content with JapMac's answer as it corresponded with my own opinion and I think he was writing tongue in cheek.
Thanks for your interest - appreciated!
The G5 as is will be fine for still image and standard graphics work.
It should run decent with an earlier version of iMovie like iMovie 6, but a better graphics card would help as well as adding additonal RAM.
You can install a Max. of 8 GBs of RAM into your G5.
Here are the specs for the type of RAM your Mac G5 needs.
8.0 GB (1.8 GHz+) Memory Slots 8 - PC-3200 (1.8 GHz+) 2.5v, unbuffered, 8-byte, nonparity 184-pin DDR SDRAM (matched pairs)
You can purchase reliable Mac RAM from online Mac RAM vendors Crucial or OWC (macsales).
If you really want to throw money at the machine, get a min 128 GB SSD drive for OS and applications and install a second drive like a 2 TB Western Digital Black or 2 TB Hitachi 7K for user data and scratch while rendering.
OR, as suggested, setup a RAID. Get a Firmtek PCI controller card that has port multiplication and connect 5 drives to create a RAID 5 array.
Add to the drives a used Geforce 6800 Ultra or Radeon X800XT to give your desktop rendering the maximum OpenGl performance possible.
These are all possibilities, but after spending the required $600-$1000 (or more), you still have the limit of 4 GB RAM and the 1.8 GHz limit, both of which are low and slow for late model software requirements.
And, all that you will gain are a few seconds off the several hour video rendering times WITHOUT full HD support.
I LOVE PPC Macs. THAT should be obvious to everyone. You realize that and I appreciate it.
BUT, as you also realize, you can't realy go faster, only optimize performance .... and that costs money.
Do it fo fun and hobby and have the money, GREAT.
I'm all for it and have several "black hole" projects.
For practicality, less than $1000 builds a blazing fast 3.5 GHz i7, 16 GB 1600MHz RAM, SSD, Radeon HD 6870 equipped machine that will render HD in minutes rather than hours, hours rather than days.....
$600 buys a faster, more capable Mac Mini.....
If you're going to fight with me, get your facts straight.
Powermac 7,2 has 8 slots
PowerMac 7,3 has 4 slots
PowerMac 9,1 is a SINGLE processor model
It appears I only have 4 slots for memory and they each hold 1Gb.
The OP has eyes...... AND posted the profiler info.