Devel user & decrease number queries I'm trying to decrease the number of my queries with the devel module but I have two questions.

1) Why do I have 281 dblog_watchdog queries? How can I get rid of them? 
Why should I keep them, I already have the apache logs?

INSERT INTO watchdog (uid, type, message, variables, severity, link, location, referer, hostname, timestamp) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6, :db_insert_placeholder_7, :db_insert_placeholder_8, :db_insert_placeholder_9)


2) How to show the number of queries for anonymous users?
Right know it doesn't show anything.
1) By default, dblog module is enabled. It is real performance bottleneck for big sites. But you can use syslog module (from core) or contrib analogs to write logs in /var/log/drupal.log and etc.
Rsyslog config can be something like this:

    local0.warning /var/log/drupal_site_err.log
    local0.info;local0.!warning /var/log/drupal_site.log


You should analize your logs and fix errors, warnings and even PHP notices. I think 281 messages per page — this is a lot.

2) On your dev site you can allow anonymous users to see devel information with permission “Access developer information”. Don't forget to disallow Devel on production.