https://www.androidauthority.com/google-pixel-delayed-notifications-3480868/
Users of the Pixel 6 series, Pixel 7 range, Pixel 8 range, and Pixel Fold have all chimed in on Reddit to complain about the problem. It’s unclear if this problem affects the Pixel 9 series right now, although none of my Android Authority colleagues have reported delayed notifications on their Pixel 9 units.
Workarounds for delayed Pixel notifications
So what’s the fix, then? Well, one touted solution on Reddit is to disable the Adaptive Connectivity setting, which enables 5G only when you need it (e.g. for video streaming). This requires users to tap Settings > Network and Internet > Adaptive Connectivity. Users have also suggested disabling Adaptive Battery (Settings > Battery > Battery Saver > Use Adaptive Battery).
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