22% quicker times on the Jubilee Line coming

This hopelessly rosy account of the Jubilee Line upgrade in Rail.co explains how the 33% capacity increase will be delivered when it's finally working properly:

So how are the statistics which kicked off this article made up? Moving from six cars to seven added 17% to the line’s capacity. Reducing headways and running trains more frequently will add the rest. Shorter waiting times at stations and the ability to run faster as distances between trains are reduced account for the 22% improvement in overall journey times. There will also be reduced congestion at stations as passengers are picked up more frequently, greatly enhancing the travelling experience.

So there won't only be longer (compared with 2005), more frequent trains, but they will be quicker - cutting journey times on the line by 22%. Apologies if you all knew that, but we didn't.