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I'm writing a simple API endpoint which allows a 3rd party site to create new users. Everything works but the 3rd party site is set up to only wait 5 seconds, and for some reason, when I create a new user and then call wp_new_user_notification() it takes around 5 full seconds to send the response. Half the time the 3rd party site times out waiting.

When I comment out the new user notification, it's almost instant. So I know the slowness is coming from that line of code. I have two plugins that deal with new user emails, but I experimented by deactivating both of them and it's still slow. Any ideas why this is happening? I looked at the source code for the function, and it doesn't look like it should take that long.

Thanks for any advice you can give me!

UPDATE:

I did a test using wp_mail()...

$time3 = time();
wp_mail( "me@gmail.com", "SUBJECT", "MESSAGE" );
$time4 = time();

echo "wp_mail(): ". ($time4 - $time3);

And I get back wp_mail(): 1

I think this suggests that the delay is inside wp_new_user_notification() but outsidewp_mail()`.

UPDATE2: I'm not receiving any email from wp_mail() when I use it in my plugin. Perhaps there's some dependency that I'm missing.

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Is it slow if you isolate the function and run it alone? Are other functions, sending emails out, slow? – Rarst♦ Sep 28 '12 at 17:43
Good idea. Can you suggest other functions that send emails? I'm not very familiar with this part of the core. – Emerson Sep 28 '12 at 17:58
Well, essentially any of them will be using wp_mail() so try testing it. – Rarst♦ Sep 28 '12 at 18:02
Updated the question with my test result. When I call wp_new_user_notification(2) it's 2 seconds, but the email doesn't arrive, so something is fishy. – Emerson Sep 28 '12 at 18:34
I'm testing with wp_mail() in a template file and wp_mail() in my plugin and the first works fine, but the second doesn't. Do you have any idea why that would be? – Emerson Sep 28 '12 at 19:25
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closed as too localized by Rarst♦ Sep 28 '12 at 20:41

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