Over the course of writing guides to boosting Mac and hard drive speeds, I’ve discussed the incredible performance improvements Macs can get from simple upgrades — adding RAM, choosing a fast solid state drive (SSD) as an internal or external drive, and even running a simple disk optimizer tool. But there’s a common question that comes up when considering upgrades: how can you tell in advance how big of an improvement you’ll actually see?

The answer: benchmarking tools. Many apps help you measure the speed of various components of your Mac, and with a little help, you can estimate the performance jumps you’ll see after an upgrade. Below, I’ll introduce three of the best free Mac benchmarking tools, and explain how they work…

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