Python addins 'reinstalled' on every arcmap startup?

Discussion created by Morag.Hawkins on Oct 18, 2011
Whilst debugging an esri addin, I noticed that python addins are executed from the directory C:\Documents and Settings\<user>\Local Settings\Application Data\ESRI\Desktop10.1\AssemblyCache\{guid}

Watching this folder, all the python addin files are recopied/reinstalled into this folder on every arcmap startup.

Just wondering if this is necessary, startup times for arcmap always get longer with every release, and this just seems to add to it - perhaps only reinstall if new version or missing?