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Optimization
When you change the bidding amount or targeting of an ad group, it will affect the bidding environment and relearning will be necessary. At the beginning of the relearning period, ad delivery may decrease. This is in order to prevent a sudden increase in the number of ads delivered.
Note: "Learning" means the system is studying the best bid amount for achieving the optimization objective (e.g. to maximize conversions or installs).
(Last updated: June 14, 2019)
When auto-bidding optimization is learning, it means the system is studying the best bid amount for achieving the optimization objective (e.g. to maximize conversions or installs). For this reason, it's very likely that you'll see improved ad performance after learning is finished.
(Last updated: June 14, 2019)
When you change an ad group's bidding configuration from manual to automatic, bidding will be optimized based on past performance data.
Also, if you change to auto-bidding without any targeting (after having already bid for ads manually with targeting for the same ad group), optimization will use past performance data until learning is finished.
If it's determined that an ad group does not have sufficient past performance data (e.g. not enough clicks or conversions), or if the data is bad (e.g. the data obtained is not suitable for learning), relearning will be necessary. In this case, the time required for learning will be about the same as when creating a new ad group.
(Last updated: June 14, 2019)