I’ve focused a lot over the last few months on helping readers to speed up and optimize Apple’s Macs — everything from adding RAM to recovering hard drive space and upgrading old hard drives to faster SSDs. Today’s How-To is focused on something very specific but with a lot of optimization potential: trimming down your Mac’s photo library.

Particularly after installing OS X 10.10.3 with Apple’s new Photos app, you might be surprised to learn that you’ve lost a lot of hard drive space, and that there are suddenly tons of duplicate photos on your Mac. After installing OS X 10.10.3, the new Photos app converted my 90GB Aperture library into a 126GB Photos library, and left both on my hard drive. That’s an incredible amount of wasted space attributable to duplicates, so it’s no surprise that a $1 utility called Duplicate Photos Fixer Pro has recently become the #1 paid Mac App Store app, while a superior alternative called PhotoSweeper ($10) is in the top 50. I’ve used both apps, as well as many others, and can help you choose the one that’s best for your needs…

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