> So, what else is running on the system? Because if there's 35GB RAM and
> the shared buffers are 1.5GB, then there's about 33GB for page cache.
> Something like 16GB would be a conservative setting.
Yes, you guessed it right. Both Web server and DB server are running in the same machine.
> I'm not saying this will fix the issues, but maybe it shows that something
> else is running on the box and maybe that's the culprit, not PostgreSQL?
Based on my observations and analysis, I'm sure that database write operation "is" causing the slowdown, but not because of other applications running in the same server.
> Then install the app again and collect as much info as possible. Otherwise
> it's all just wild guesses.
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