Query performance question

Hi,

I'm having trouble with an obviously simple query that just doesn't
perform quite good IMO.

I have two tables:

httplog=# \d hits
                              Table "hits"
  Attribute  |   Type    |                   Modifier
-------------+-----------+-----------------------------------------------
 id          | integer   | not null default nextval('hits_id_seq'::text)
 page_id     | integer   | not null
 referrer_id | integer   | not null
 ip_addr     | inet      | not null
 time        | timestamp | not null
 domain_id   | integer   | not null
Index: hits_pkey

httplog=# \d referrer
          Table "referrer"
 Attribute |     Type     | Modifier
-----------+--------------+----------
 id        | integer      |
 url       | varchar(300) |
Index: referrer_pkey

These are part of an HTTP-log database. Table 'hits' has about 7000
rows, table 'referrer' has about 350 rows. Now I want to know what the top
ten referrers are, and I issue this query:

SELECT count(*), url FROM hits, referrer WHERE referrer.id = referrer_id
GROUP BY url ORDER BY count DESC LIMIT 10;

And this query takes almost five seconds to complete, and that seems to me
quite slow. The database is running on a Duron 700 with 256 MB RAM and
ATA-66 disks. Operating system is FreeBSD-4.2.

Are there some tuning knobs I could turn?

regards,
le

-- 
Lukas Ertl                          eMail: l.ertl@univie.ac.at
WWW-Redaktion                       Tel.:  (+43 1) 4277-14073
Zentraler Informatikdienst (ZID)    Fax.:  (+43 1) 4277-9140
der Universität Wien