Slow UNIX system this morning

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http://www.unix.com – Hi, what would be the first things to check on a system that normally works fine, and is not so fine this morning ? Its accessing menus and various other screens 100x slower than normal. Version: UnixWare 5 7.1.3 i386 SCO UNIX_SVR5 I have tried this pf -ef|grep paulc and found a huge list of "defunct" processes from this user, not sure if that has anything to do with it ? (HowTos)