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

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