Logic Pro 7.2.3 is now available in Software Update for affected users, and via direct download:
Logic Pro 7.2.3 addresses performance issues when Logic Pro 7 is used on Mac Pro and G5 Quad computers. Logic Pro 7.2.3 is recommended for all Mac Pro and G5 Quad users. An existing Logic Pro 7.2.1 or Logic Pro 7.2.2 installation is required for this update.
Note: Logic Pro 7.2.3 is optimized for PowerPC G4, G5 and Intel based Macs with up to 2 dual-core processors.
Logic Express was updated to version 7.2.3 (download) with the same description.
Yesterday, Apple released updates to some of its other professional applications.