Filter Early and Do Expensive Operations Late

The automation move: Order transformations so refresh stays fast and reviewable. Why it works Microsoft's Power Query best practices recommend filtering data as early as possible and doing expensive operations last when possible. The mechanism is workload reduction. Filters can often stream or fold back to the source, reducing the data that later steps must process. Sorts and some aggregations may require reading far more data before returning a result. For spreadsheet automation, performance is also a governance issue. Slow queries discourage review. People start adding manual helper tabs because the 'official' automation is painful to edit. A clear step…

Sign up free — one personalized lesson every day, matched to your role and goals.

Already have an account? Sign in