Google Ads Optimisation: 12 Tactics to Cut Waste and Boost ROAS in 2026

By Aisha Rahman, PPC Specialist | Google Ads Certified | 8 Years Managing $50M+ in Ad Spend | April 2026

Evidence Grade: A — Based on audit of 180+ Google Ads accounts, Google Performance Planner data

The Google Ads Waste Problem

According to a 2025 WordStream analysis of 50,000 Google Ads accounts, the average SME wastes 76% of their Google Ads budget on irrelevant clicks, poor match types, and unconverted landing pages. This represents billions in annual wasted spend.

The good news: most waste is fixable with systematic optimisation. Here are the 12 highest-impact changes.

12 Optimisation Tactics

  1. Switch to Exact and Phrase Match: Broad match keywords waste 40–60% of budget on irrelevant searches. Audit and tighten your match types first.
  2. Build a Negative Keyword List: Add 50+ negative keywords from Search Terms Report immediately. Block job seekers, students, and irrelevant industries.
  3. Enable Conversion Tracking: 34% of accounts run without proper conversion tracking. You cannot optimise what you don't measure.
  4. Use Ad Schedule Adjustments: Pause or reduce bids during low-converting hours. Most B2B conversions happen Tuesday–Thursday, 9am–5pm.
  5. Implement RLSA: Remarketing Lists for Search Ads deliver 2–3x better conversion rates by targeting people already familiar with your brand.
  6. Optimise Quality Score: Every point increase in Quality Score reduces CPC by 16%. Align keywords, ads, and landing pages tightly.
  7. Test Responsive Search Ads: Use all 15 headline and 4 description slots. RSAs with high Ad Strength outperform standard ads by 11%.
  8. Leverage Smart Bidding Correctly: Target CPA and Target ROAS work well — but only with 30+ conversions/month. Below that, manual bidding typically wins.
  9. Segment by Device: Mobile vs desktop conversion rates often differ by 40–60%. Set device bid adjustments accordingly.
  10. Run Ad Rotation Experiments: A/B test headlines systematically. Even a 10% CTR improvement compounds significantly over time.
  11. Audit Search Partners: Google Search Partners often deliver lower-quality traffic. Analyse and exclude if CPA is 50%+ above Google Search.
  12. Optimise Landing Page Speed: A 1-second delay in load time reduces conversions by 7% (Google, 2025). Aim for under 2.5 seconds on mobile.

"After implementing a 90-day optimisation programme on our Google Ads account, we reduced CPA by 52% while maintaining lead volume. The changes were systematic, not magic." — Jennifer Ooi, Marketing Manager, FinFlow Asia

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