I can confirm this using zsh 4.3.17 in Ubuntu Precise, using your
config.

I am adding a full test case to the description.

** Changed in: zsh (Ubuntu)
   Importance: Undecided => Medium

** Changed in: zsh (Ubuntu)
       Status: New => Triaged

** Description changed:

  $  apt-cache policy zsh
  zsh:
    Installed: 4.3.6-4ubuntu1
    Candidate: 4.3.6-4ubuntu1
    Version table:
  
  When using auto completion to list files in directories with certain 
characters, zsh enters a loop and uses 100% CPU(50% to be precise as I have 2 
cores) for a while, almost 30 seconds on Desktop
  I haven't exactly found out the problematic characters but I've got a 
reproducible case.
  
- To reproduce do the following:
+ TEST CASE:
  
+ $ cd /tmp
+ $ wget 
https://bugs.launchpad.net/ubuntu/+source/zsh/+bug/351129/+attachment/1058927/+files/.zshrc
+ $ export ZDOTDIR=/tmp
+ $ zsh
  $ mkdir 2k5\ Express\ line+SPs
  $ 2k5\ Express\ line+SPs/<tab>
  
  This should show files inside the empty folder you have just created but
  instead zsh enters a loop and locks the CPU for a while.

** Changed in: zsh (Ubuntu)
   Importance: Medium => Low

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https://bugs.launchpad.net/bugs/351129

Title:
  Problem in completion with certain characters in folder name

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