Feed-Based Text Ads: How does Per Partes work?
It’s a process of gradually enabling keywords in your ad group, starting with the longest keyword. This feature makes sure that the longest keyword will be turned on first & if it doesn’t have enough search volume, we will pause the current keyword & turn on the next shorter keyword. Keywords are checked every 4 hours for their eligibility.
The remaining keywords won't be turned on after an eligible keyword has been found. But since we are using Broad Modifier match type, it will cover the shorter more generic keywords anyway.
You can turn Per Partes off if you want to activate all truncated keywords which will maximize impressions & clicks but more generic keywords will also get you a lot of unwanted & irrelevant traffic driving the cost higher without many conversions, especially when you are using Broad match type.