What is the fastest way to detect low CTR issues in Search Console?

Short answer: The fastest way is to break the performance report down by query plus page and compare high-impression rows against your own site's position-based CTR curve: rows that sit clearly below your typical value for the same position range form the problem list.

Rapid diagnosis flow

• Pick a 28-day window; daily fluctuation ruins the diagnosis.
• Derive the CTR-by-position curve from your own data; external average CTR tables do not represent your site.
• Filter query-page pairs with high impressions and CTR below your own curve.
• Separate brand from non-brand queries; brand queries inflate the average.
• Classify causes: title mismatched with query intent, weak meta description, SERP features absorbing clicks, or the wrong page ranking.

For analysis at scale, move the data to BigQuery via the Search Console bulk export; curve calculation and filtering then run automatically as queries.