I noticed that in the new version Iris uses so much CPU. The problem is found and I have an idea how to fix it. In the next version Iris will use 0 CPU again.
Meanwhile the development environment for Mac seems to be working even trought I run it on Mac 10.6.8 Snow Leopard. So Iris should work on very old Macs.
The problem I think is that I can’t test Iris on new Mac, bacause I don’t own one. When we post the version for Mac I will really appreciate feedback from users with newer Macs.