Using IS 2011 on mutliple VMs the Install / Uninstall are extremely slow. The VMs have plenty of memory and diskspace but getting lots of page faults and the CPU goes to 100%. The same install package built using IS 2009 runs fast and does not have the issue on the same VMs. For example an Uninstall typically takes around 5 minutes is taking 90 minutes under IS 2011.
Found / resolved the issue. The problem had to do with installscript writing a log file entry for each file being installed or uninstalled. The logic used the script call FileInsertLine which worked fine under IS 2009 but is very slow under IS 2011. Rewrote the logging function to just use WriteLine and that fixed the performance issue.
