The Programmatic Glossary
A practical glossary designed to help marketers, advertisers and ad-tech professionals understand the terminology that powers programmatic advertising
Technical Infrastructure
Timeout Management
The practice of setting time limits on how long the system waits for bid responses from demand partners before giving up and either using a fallback ad or leaving the slot empty. It is a balancing act between giving buyers enough time to respond and ensuring the page loads quickly for users.
HOW IT WORKS
In header bidding and RTB (Real-Time Bidding), each demand partner is given a time window (the timeout) to submit a bid. If their bid does not arrive within the window, often 300 to 600 milliseconds, they are excluded from the auction. Too short a timeout excludes slow but valuable bidders. Too long a timeout delays page rendering and harms user experience.
EXAMPLE
A publisher sets a 400-millisecond header bidding timeout. DSP A (Demand-Side Platform A) consistently responds in 80 milliseconds and wins frequently. DSP B typically takes 500 milliseconds, just over the limit, so their bids are excluded. The publisher extends their timeout to 600 milliseconds. DSP B now participates, increases competition and lifts average CPMs (Cost Per Mille) by 8%.
RELATED TERMS
Header Bidding | Prebid | Server-Side Header Bidding | QPS (Queries Per Second) | Fill Rate
★ LIMELIGHT INSIGHT: Limelight's infrastructure is optimised for fast bid response times, ensuring demand partners can consistently participate within publisher timeout windows.
