What Is Ad Refresh and How Does It Work?
Ad refresh is the practice of reloading ad units while a user is still on a page—without requiring a full page reload. This allows publishers to serve multiple impressions per session, increasing overall ad inventory and potential revenue.
However, not all refreshes are equal. Poorly timed or excessive refreshes can backfire, reducing viewability, frustrating users, and hurting CPM in the long run.
Why Ad Refresh Can Boost CPM—If Done Right
When implemented properly, ad refresh strategies can positively affect your CPM in several ways:
- Increased impressions per session means more monetization opportunities per user.
- Higher engagement signals from active users can result in better targeting and higher bids.
- Improved fill rates due to more available inventory served under optimal conditions.
But the real key lies in balancing frequency, relevance, and viewability.
Types of Ad Refresh Triggers
There are several common methods publishers use to trigger ad refreshes:
1. Time-Based Refresh
This is the simplest method. Ads refresh every fixed interval, such as every 30 or 60 seconds. It’s widely supported but must be used with care—too frequent, and it reduces viewability; too slow, and you lose potential impressions.
2. Event-Based Refresh
Ads refresh based on user actions—scrolling, clicking, or viewing new content. This keeps refreshes relevant and less disruptive, especially for interactive or dynamic sites.
3. Viewability-Based Refresh
Advanced setups only refresh ads when they meet minimum viewability standards (e.g., 50% of pixels in view for at least 1 second). This helps ensure refreshed ads still qualify for high CPM bids.
Best Practices for Refreshing Ads
To make the most of ad refresh while keeping CPM strong and user experience intact, follow these principles:
- Respect time gaps: Avoid refreshing too often. Stick to 30-90 second intervals to avoid spammy behavior.
- Refresh only viewable ads: Don’t waste impressions on units that users can’t see. This protects your viewability score.
- Disclose refresh behavior: Some ad partners require transparency. Always check SSP policies before enabling refresh.
- Monitor impact on revenue: Track CPM, fill, and RPM before and after implementing refresh to evaluate actual impact.
Example: A Publisher's Smart Refresh Setup
Let’s say a news publisher sees high session duration on long-form articles but limited inventory per session. They implement viewability-based ad refresh with a 45-second interval. Only ads in view are refreshed, and a maximum of 4 refreshes per session is allowed.
After 30 days, results show:
- CPM increased by 12% due to better engagement and higher quality impressions
- Total revenue per session rose by 27%
- Viewability remained stable at 65%, keeping advertisers happy
This example shows how thoughtful refresh policies can drive more revenue without sacrificing CPM or user trust.
Tools to Implement Ad Refresh
You don’t need to code everything manually. Here are some tools that support smart ad refresh:
- Google Ad Manager (GAM): Offers built-in ad refresh settings based on time or viewability.
- Prebid.js: Supports custom refresh logic in header bidding environments.
- Third-party wrappers: Many SSPs provide managed services that handle refresh logic while ensuring compliance.
Things to Avoid When Using Ad Refresh
Refresh tactics can turn against you if abused. Avoid these pitfalls:
- Refreshing ads off-screen or outside user view
- Ignoring network partner policies—some SSPs ban auto-refresh completely
- Using too short refresh intervals (under 20 seconds)
- Not tracking impact on user experience and bounce rate
Final Thoughts: Refresh Wisely for Long-Term Gains
Ad refresh is not a shortcut—it’s a strategy. When aligned with user behavior and ad quality, it drives both CPM and revenue upward. But when misused, it burns trust and lowers value.
Be transparent, test carefully, and let the data guide you. With smart refresh policies, you can make each session count—and make your CPM rise with it.
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