find-the-slowness.txt
This takes <n> seconds and shouldn't: <paste the code or describe the
operation>

Don't optimise anything yet.
1. How do I measure where the time actually goes? Give me the specific
   tool or the timing code to add.
2. Given this code, what are the candidates, ordered by how often each
   turns out to be the real cause?
3. Which single measurement distinguishes between them?

I'll come back with numbers. Then we fix the biggest one only.

In server code, check for a query inside a loop before anything else. It's the cause more often than everything else combined.