AppStats would not measure SSL overhead as it starts tracing requests after 
SSL termination. From your screenshot I see no time spent in executing 
RPCs, so probably these requests are consuming high CPU cycles. Do you see 
anything in cpu_ms in request logs? If so, have you tried increasing 
frontend instance class and see if that has any impact on latency?


On Saturday, 15 November 2014 23:23:48 UTC+1, Alex Fu wrote:
>
> I recently turned on SSL for my AppEngine (Java) project and noticed a 
> decrease in response time. I enabled AppStats for AppEngine and proceeded 
> to hit an endpoint of mine: Screenshot 
> <https://lh4.googleusercontent.com/-qUv7q44ED3M/VGfRF_c5QJI/AAAAAAAACIQ/yi3RsltYXMI/s1600/Screen%2BShot%2B2014-11-15%2Bat%2B5.16.11%2BPM.png>
>
> AppStats reports zero overhead (real=5123ms api=0ms overhead=0ms cost=0 
> billed_ops=[]). 
> I know SSL can introduce some overhead and latencies but a ~5s wait is a 
> bit much for a simple GET that normally take less than a second to complete.
>
> Is there any better way to debug this?
>

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