After upgrading to 10.4.7 I started noticing frequent slowdowns in Safari. The "Spinning Rainbow Cursor of Death" was becoming a constant occurence.
There are plenty of recommendations about how to fix this common issue.
/System/Library/PrivateFrameworks/Syndication.framework
with a copy from a Mac OS X system that does not have problems
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Posted by ellen at September 24, 2006 08:13 PM
turn off then on your router or cable modem (subscription required)
I've found that things improved after installing unlockupd, but am not certain the problem is gone yet.