The article says a few lines down, "The optimization #1 appears to give huge benefit on big Intel servers as well, while optimization #2 is Power-specific. Afte

The article says a few lines down, "The optimization #1 appears to give huge benefit on big Intel servers as well, while optimization #2 is Power-specific. After long rounds of optimization, cleaning and testing #1 was finally committed by Andres Freund." Also, the chart indicates that the benchmarks shown were run on Xeon chips.