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First time download is slow

Posted by refschool 
First time download is slow
May 12, 2014 04:53AM
hello,
i have a dedicated server, Debian distro, Apache the website is based on a prestashop ecommerce script, recently i added Nginx as a reverse proxy and set up a basic configuration. It works ok, i reduced TTFB from 5 to 2 seconds on average, but the first time i access my website (whenever i open my browser and type the url), it has a TTFB (time to first byte) of 6 to 10 seconds ! but subsequent page loads are ok average TTFB of 2 seconds.

Is it normal?
thank you for any help
Re: First time download is slow
May 23, 2014 10:14AM
I enabled caching and load time improved, but that leads to other problem, sometimes i have a blank page and i see in the log this error message :
*2935 upstream prematurely closed connection while reading response header from upstream
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