Apple CEO Tim Cook revealing the new MacBook. REUTERS/Robert Galbraith The new MacBook is Apple's thinnest, lightest laptop ever. But it's also a major step backward.

Speed test data uploaded to Geekbench reveals that when it comes to the processor, the new laptop is on par with the MacBook Air that Apple released way back in 2011, MacRumors reports.

The processor has a single-core score of 1,924 and a multi-core score of 4,038. (A higher number is better, indicating faster speeds.) In contrast, the mid-2011 i5 MacBook Air clocks in with 2,192 and 4,288.

For reference, the high-end mid-2014 MacBook Pro has a single-core score of 3,876, and 14,703 for multi-core.

The data comes from a single MacBook rather than a combined average of multiple tests (as is standard on Geekbench), and it has since been deleted. (A cached version is available here.) But it's in keeping with what we know about Intel Core M processors, which Digital Trends notes "are slower than their standard Core equivalents."

Of course, the new Macbook will have other advantages over the 2011 MacBook Air. Its graphics processing will be considerably faster, for example, and most likely contribute to faster overall performance.

But still: The device's processor is weaker than one included in Apple devices four years ago. It's just part of the extraordinary lengths Apple has undergone to cut down on the size of its latest laptop. The device has also been criticised for ditching all its traditional ports — including the charger — in favour of a single universal USB-C port. This means users can't plug in a second screen or copy files to their iPhone at the same time as charging their MacBook unless they buy an add-on splitter cable.

Photos of the inside of the device also reveal that the actual logic board — the brain of the computer — has been shrunk down to a tiny size to make room for all the batteries required. According to Digital Trends, its logic board is actually smaller than the notably compact Raspberry Pi computer.

As Geekbench's speed test suggests, that size comes as cost.