Q: >> Do I pay for SSL for the website? Google does host the domain if that matters. <<
R: If you're using the SSL from Google ('Enable Managed Security' on GAE's Settings page), then it is free. It's the free certificate from Lets Encrypt which Google automatically renews for you every 90 days
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Q: >> if I use the app 100% of the month do I get a discount? <<
R: GAE Standard gives you a DAILY quota of free resources. You're only charged for resources above this free quota.
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Q: >> First, in standard how long does the app take to start up for a small WordPress site. <<
R: Not sure one can provide a direct response to this. I guess it depends on what your code does before it serves a page/request
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Q: >> If I set the instances to 0 and 1 when the visitor is on the site then leaves and the instance is 0 once again. is there any noticeable lag for the user? <<
R: My experience is that there is a noticeable but not earth shattering/uncomfortable lag when an instance is first starting up (you're going from 0 to 1 instance). GAE documentation talks about having
warmup requests to speed things up