I posted this request in the PowerMac forum of MacRumors.com earlier today, but they immediately deleted the post and permanently banned my account. I'm surprised and quite disappointed by their harsh behaviour. Seems like they are not willing to help open source developers support their platform.

As you'll probably know, I added support for parallel conversions in the 20140921 snapshot. Speedups were great on the computers I tested on and users reported similar results on their systems. However, I have not been able to test the parallel conversion mode on multi-processor PowerMacs, yet. I only have a single-processor G4 PowerBook to test the PowerPC version on, so I'm now looking for people who could give it a try on a dual/quad PowerMac. Results for a quad G5 would be especially interesting.

If you would like to help, please use the 20141005 release for your tests. Note that you will need at least OS X 10.5 Leopard for fre:ac to work. Additionally, you'll have to enable parallel conversions on the Resources page of the configuration dialog, as it is still experimental and disabled by default. Also note that parallel processing is supported for file conversions only, not CD ripping (unless you have multiple drives).

Please post your results in the SourceForge forum or send them to info@freac.org. Thanks to everyone who participates!