That could be a variation on this:

Delayed Response When Editing Internet Explorer Forms and
Microsoft Outlook Express may take a long time to start
(Pstores.exe and Pstores.dll)
http://support.microsoft.com/?kbid=251787
http://support.microsoft.com/?kbid=271510
OLEXP: Outlook Express Slow to Open Mail and Web Links
http://support.microsoft.com/?kbid=311030
Also see:
http://www.insideoe.com/problems/performance.htm


--

Mike - http://pages.prodigy.net/michael_santovec/techhelp.htm


"Blaine De Fries" wrote in message
...
Being the sloppy typist I am I end up using the delete key a lot to
delete a few mis-typed characters and resume my keying. Whenever I do
this in Outlook Express 6.0 it is EXTREMELY SLOW to delete the
characters and allow typing to resume (although it does seem to buffer
the correction characters I type and they ultimately appear). Is this
just my version of OE 6.0 that does this or is this a known issue. If
it is known is there any way to resolve the issue (a fix or
something)? It can make typing an email very frustrating. This only
happens with OE 6.0 and only with the delete key.