Unnecessary query?
 

In global.php
$show['modcplink'] is being set (for the ModCP-Link in template footer).

This seems to trigger a query in can_moderate() if the user is not an admin or supermod - for every page being generated.

I wonder if it wouldn't be possible to use some cache (datastore) instead to avoid this query and if this could improve performance?

the first if does just use the permission cache, so no query is done until:
then as forumid is 0 on that position, it's going through the modcache itself and looking if the user is in so, no query is done there either, just if the cache has not been created, it will do a query.

> just if the cache has not been created, it will do a query.
That's the point.

$imodcache is being build in cache_moderators() which itself gets called from forumdisplay.php, index.php, search.php & usercp.php - after processing global.php.

And what about the others like showthread.php, newreply.php and so on?

Seeing as cache_moderators() requires a query and so does can_moderate() using can_moderate() would be prefered as its doing less work. It does seem that in my RC3 copy that they have 'forgotten/not included yet' the caching in the can_moderate() function, the $modcache variable is there, yet its never set, which causes extra queries every time can_moderate() is called where it could quite possibly return a cached value instead.

*bump*
Now that RC4 is available it seems like this doesn't have changed :(

Example
-----------
If a thread is being displayed (by a normal user, 40 posts/page) and can_moderate() is being called from the postbit I get 42 (!) times the same query:

So once again, is that necessary? ;)

ugh you querry freaks :P

So you have 42+ queries on that page? Thats not good. I'm sure some caching is ment to be used in the function, create a bug report at vB.com.

Whoa... ive never seen more than 12 querrys on any page in vB3 >.< (cept admincp)

@Faranth
It's very easy to reproduce:

1) Take a vanilla vB3 RCwhatever
2) Enable debug mode (to see # of queries)
3) Put an <if condition="can_moderate()"></if> at the start of template postbit
4) Display a thread with > 40 posts as a normal user (setting display-mode to 40 posts/page)

you should definitely report it.

vb.com will surely look into it :)