Google Ads is rolling out a new feature in Performance Max reporting that allows advertisers to view the share of cost for each channel. Advertisers can switch on a cost slider to see the percentage of total spend each channel consumes. This feature is valuable as it helps identify channels overspending relative to returns, guides optimization decisions, and indicates potential for scaling channels with a favorable cost-to-return ratio.
The PMax Channel Reporting Beta got a new Cost Slider to get "Share of cost" Data for each Channel. You just need to switch on the slider and the share of cost data gets calculated and shown.
Share of Cost shows exactly what percentage of your total PMax spend each channel or network is consuming.
When you cross-check Share of Cost with conversion share and value, you will see if a channel is overspending without delivering proportional returns.
If your best-performing placement has a small Share of Cost but a good ROAS or low CPA, then this is a green flag.
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