Trigger overhead/performance and alternatives?

Hello,

Apologies if this is not in the correct forum for the non-urgent question
that follows.

I was reading the pgconf 2018 ppt slides by Jonathan Katz (from slide 110
onwards)
http://www.pgcon.org/2018/schedule/attachments/480_realtime-application.pdf

Where is mentioned trigger overhead, and provided an alternative solution
(logical replication slot monitoring).

My 2 part question is.

1) Does anybody have any benchmarks re: trigger overhead/performance or have
any experience to give a sort of indication, at all?

2) Is anybody aware of any other clever alternatives, pg extensions or
github code etc as an alternative to using triggers?

Thanks in advance,




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