I have just looked up those charts on Timescales website [1] and I am a bit surprised. Never extensively used any of those DBs, but I have seen their sources and must say that expected bigger gaps [2]. Also worth looking: the Taxi Rides Benchmark on Postgres vs Clickhouse [3].
[1]: https://www.timescale.com/blog/what-is-clickhouse-how-does-i... [2]: https://www.pradeepchhetri.xyz/clickhousevstimescaledb/ [3]: https://tech.marksblogg.com/benchmarks.html