I tried to replicate my "480p video at 128kbit/s" experiment  with AV1.
The speed was 0.068x realtime (with libaom and default --cpu-used). This means a 15 min video ended up encoding more than 3.5 hours.
While the quality was "watchable" and slightly better than x265 at the same low bitrate, it's #notworthit yet, maybe unless you are a viral video hosting company.
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