What I Want
I want to simulate the performance of a normal hard drive on my SSD based development machine.
Background
I'm developing a Mac application on a Macbook with an SSD. It's gloriously fast.
If someone has a standard platter hard drive, my app will be slower for them. My app is heavy on Core Data too, so the disk access speed will be a significant factor.
I worry that the performance measurements I take with Instruments look fine, but when a customer runs my app on their normal hard drive it will be achingly slow.
What I've Tried
Before I installed my SSD, I measured the performance of my app in Instruments. After the install, I measured it again and the two benchmarks were identical.
This doesn't make sense to me. I'm convinced I was doing something wrong here. Instruments probably measures clock speed, not wall time speed. But still, surely the speed of the hard drive should affect the benchmark I took? Or does Instruments somehow compensate for this?