Just over a week ago when Apple launched the new iMacs, she promised they would be "up to 2x faster". And, by the way, it wasn't bitch.
a benchmark iMac19.1 came up on Geekbench and their numbers impress: 6,314 On test single-core, 33,713 at the multi-core. Comparatively, the previous model (which topped the Geekbench chart) scored 5,684 and 19,371, respectively, indicating that the new bring performance jumps of around 11% and 74%.
Another curious comparison with an iMac Pro, which was released in 2017: the new ?normal? iMac outperforms its single-core score (5,321) by 19% and is very close to its score. multi-core (35,918).
Pear Summary: The new iMacs may not have changed anything out of the box, but in terms of performance, at least they really will look good with the new Intel Core i9 chip octa-core 3.6GHz.
Update 3/29/2019 10:04 AM
Now that more iMacs are already reaching consumers, Geekbench developer Primate Labs has managed to compile a nice number of benchmarks to compare.
Here are the graphics:
21.5 ? iMac
In new models with Intel Core i3 and i5 processors, the performance gain single-core stay in the house of 5-10%, while the multi-core varies 10% to 50%.
27 ? iMac
In larger models, the gain single-core in 6-11%, while the multi-core hits 43-49% in the versions hexa-core and at 66% in the versions octa-core.
All of these gains are due to higher frequencies and some models with more cores in their processors, as the chip architecture itself has not changed this time.