It could be anything but try to narrow down, have you try making the changes to PIX from a different machine to see if same behaviour?
What version of PIX code does your pix have? 6.3(?). Does this happens at the PIX command line or when in PDM? check your version code and bugs database based on your pix code. If you rule out is not the PC you're connecting from that is slow you may want to check PIX overall performance, bellow link.
This happens at the command line. PDM is disabled. The reason why I don't think about the PC is because I have another PIX behind this one which does not have this problem at all. I tried the connection on a different PC and still the same.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...