%% Last Updated: [[2021-03-06]] %% # It's Time for Shift-Left Performance Testing [Readwise URL](https://readwise.io/bookreview/7998103) | [Source URL](https://go.forrester.com/blogs/its-time-for-shift-left-performance-testing/) --- ![](https://readwise-assets.s3.amazonaws.com/static/images/article3.5c705a01b476.png) --- Amazon's Prime Day 2018 glitch, when it couldn't handle traffic loads, could have cost the giant up to $72 million, and Mobify has determined that every 100-millisecond decrease in home-page load speed contributed to nearly $380,000 in increased annual revenue. ^150794300 **References:** https://instapaper.com/read/1387099675/15634472 --- > will take on new responsibilities (see figure). > \ > \ > \ > Know That You'll ^150794301 **References:** https://instapaper.com/read/1387099675/15634477 ---