In the pricing page for Lakeflow Declarative Pipelines (formerly DLT), for serverless it shows a single cost of $0.35/DBU for both standard and performance optimized. But in the feature table below, it says standard is "Up to 70% cheaper than running in the Performance optimized mode".

I'm trying to estimate costs and I'm not sure how, since I don't know which mode runs for the listed cost. Is standard cheaper or performance costlier? How do I compare costs between the two?