Expectedly, two DBs are significantly worse at inserting larger documents, but performance is again very close - slight edge for Postgres with 2213 inserts per second vs 2171 for Mongo.
3. Mention any breaking changes
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The sound is high quality for smart glasses, though obviously they compare poorly to the best wireless earbuds. I found they have minimal (but not non-existent) sound leakage. When watching movies, TV shows, and YouTube videos, I was happy with the sound. I did experience some technical issues, however. When connected to my MacBook, I could not get the RayNeo Air 4 Pro to play audio instead of the MacBook speakers. That could be an Apple problem, of course.