This was discussed during the product launch at Google I/O. There’s no PVC in the Pixel 3a. The computational photography did a lot a work tuning every different part of GCam so that it would run quickly on the Snapdragon (don’t forget, the original Pixel didn’t have a PVC either and GCam runs on it just fine, in addition to all the unofficial GCam ports to all non-Google devices). According to reviewers this works quite well.
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