You should be able to answer this by tailing the log of your nginx and orig server at the same time.
It would be helpful if you shared an (anonymized) section of both logs. When I say fast or slow
I might mean something very different to what you hear.
> On 11 Feb 2019, at 10:06 AM, joao.pereira <nginx-forum@forum.nginx.org> wrote:
>
> Just to add more information, I also have:
>
> proxy_cache_use_stale error
> timeout
> invalid_header
> updating
> http_500
> http_502
> http_503
> http_504
> http_404;
> proxy_cache_background_update on;
>
> Posted at Nginx Forum: https://forum.nginx.org/read.php?2,282984,282985#msg-282985
>
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