In a report published this week, the research center said its prior methodology, in place since 2019, worked well during periods of low mining profitability but exhibited “shortcomings” when profits surged, particularly in 2021. The previous index equally weighted all profitable mining machines in use, which led to an overrepresentation of older, less efficient models when mining was highly lucrative. “Evidence suggests this bottleneck resulted in even next-generation hardware being stored in warehouses due to a lack of space in data centers,” the report stated.