By WWII, scientists had already begun looking at alternative gelling substances for routine use in bacteriology, but concluded that agar was still better as it is both firmer and easier to handle. Today, some specialized microbiology applications use the colloid carrageenan (extracted from red seaweed Chondrus crispus, or “Irish Moss”), a more transparent and less auto-fluorescent alternative to agar (agar emits its own background fluorescence when excited by light). However, for routine bacteriological use, carrageenan is more difficult to dissolve, requires higher concentrations, can degrade at high temperatures, and forms weaker gels, which may result in puncturing its surface during the plating of cells.
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PostgreSQL Asynchronous Commit that can be used in a similar way to Mongo's j: false; significantly speeding up writes, at the risk of losing most recent data modifications: https://www.postgresql.org/docs/current/wal-async-commit.html. There also are Unlogged Tables, with changes not written to the WAL (Write Ahead Log): https://www.crunchydata.com/blog/postgresl-unlogged-tables
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