Apple has released iPhoto 5.0.2 Update which addresses issues with application performance on older Macs and improves the stability of book layout, slideshows, and more. Changes include:
• The book layout mode now allows resizable thumbnail photos for easier layout
• Slideshow performance is improved on G3 systems
• The exporting of slideshows to iDVD has been improved
• Photo-editing performance is dramatically enhanced on G3 systems
• The “Fit Slideshow to Music” feature more tightly synchronizes slideshows with music
More info and download link (5.5 MB) here.