Nothing in the configuration part you provided rings any bell to me on why
this is going on.
I suggest you take a deeper look at the server level, see if there is not
something that might have an impact there.

Also, the usual recommended process to seek for the source of the trouble
is to find what triggers is either by:
- Starting from the minimal configuration serving your files over both
protocols and, provided the problem disappeared, progressively add
directives again until it triggers
- Starting from your current configuration, progressively remove tweaking
directives until you reach the minimal configuration or the problem
disappears

If you got a minimal working example still affected with that problem, I
suggest you provide us with it (after having anonymized what appears
sensitive to you). If it can be reproducted, then it might be something we
missed or a bug.

Happy digging! :o)
---
*B. R.*

On Wed, Feb 4, 2015 at 2:23 PM, rafaelr <nginx-forum@nginx.us> wrote:

> B.R.
>
> They are serving exactly the same resources at the same time... My vhost
> points to the same folders for each domain. Files are accessible over HTTP
> and HTTPS. The slow down comes when downloading (the same resource) from
> HTTPS. For example:
>
> http://webmail.domain.tld/test.zip (30MB file can be downloaded at
> 4-5MB/s)
> https://webmail.domain.tld/test.zip (30MB file can be downloaded at
> 300-700kb/s)
>
> I enabled SPDY to see if that would've made a difference but it didn't. I
> do
> have SPDY currently enabled.
>
> Posted at Nginx Forum:
> http://forum.nginx.org/read.php?2,256386,256440#msg-256440
>
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> http://mailman.nginx.org/mailman/listinfo/nginx
>
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