I tested my app with instruments:

When scrolling table views, it’s around 20-50 fps, (more like 25 average). Is that good enough? I’ve reused the table view cells and did quite a lot of optimisations.
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Slow frame rates are like pornography – hard to define but you know it when you see it.
In other words, worry about the feel, not the numbers. If it feels laggy, it is.