Is your firefox3 slowing your computer down?

Apparently firefox can slow down not just firefox, but your whole Linux computer, according to the results posted in this thread. I read the "vacuum" tip here and tried it on my computer at home. Here's the "before" picture:

-rw-r--r-- 1 collin users     7168 2011-02-16 19:50 content-prefs.sqlite
-rw-r--r-- 1 collin users   576512 2011-03-05 21:56 cookies.sqlite
-rw-r--r-- 1 collin users     5120 2011-03-05 20:30 downloads.sqlite
-rw-r--r-- 1 collin users     4096 2011-03-05 21:56 formhistory.sqlite
-rw-r--r-- 1 collin users     2048 2010-12-28 10:54 permissions.sqlite
-rw-r--r-- 1 collin users   446464 2011-03-05 21:56 places.sqlite
-rw-r--r-- 1 collin users     2048 2011-03-05 21:41 search.sqlite
-rw-r--r-- 1 collin users    18432 2011-01-18 18:39 signons.sqlite
-rw-r--r-- 1 collin users 15332352 2010-11-02 16:04 urlclassifier2.sqlite
-rw-r--r-- 1 collin users 46837760 2011-03-05 21:44 urlclassifier3.sqlite
-rw-r--r-- 1 collin users   412672 2011-03-05 20:29 webappsstore.sqlite

And here's the "after" one:

-rw-r--r-- 1 collin users     7168 Mar  6 08:02 content-prefs.sqlite
-rw-r--r-- 1 collin users   445440 Mar  6 08:02 cookies.sqlite
-rw-r--r-- 1 collin users     2048 Mar  6 08:02 downloads.sqlite
-rw-r--r-- 1 collin users     4096 Mar  6 08:02 formhistory.sqlite
-rw-r--r-- 1 collin users     2048 Mar  6 08:02 permissions.sqlite
-rw-r--r-- 1 collin users   151552 Mar  6 08:02 places.sqlite
-rw-r--r-- 1 collin users     2048 Mar  6 08:02 search.sqlite
-rw-r--r-- 1 collin users    18432 Mar  6 08:02 signons.sqlite
-rw-r--r-- 1 collin users  3257344 Mar  6 08:02 urlclassifier2.sqlite
-rw-r--r-- 1 collin users 35360768 Mar  6 08:03 urlclassifier3.sqlite
-rw-r--r-- 1 collin users   412672 Mar  6 08:03 webappsstore.sqlite

Just a few files had a significant reduction, but I thought I'd tell you about this anyway.

So, if your computer is slow and you use firefox3, this might help. btw there are instructions at the link above for how to "vacuum" firefox on Windows, too.