Here is a video I did 2 weeks ago. It's taken from my hackintosh running 10.5.8 (same as a regular mac, just the kernel has been... updated and I can use better hardware. Currently sporting a Phenom 955 and a Geforce 9800GT. Oh yeah, it's cheaper too!)
As you can see everything works perfect, full 60fps even with my horrendous fake bloom. This also means full dx9 compatibility.
I'm not here often, and I don't use Construct often, but I was told there would be a Linux version of Construct as soon as SDL was able to do what DirectX does. (This was months ago.) Considering I have no experience with either SDK, I assume this will never be possible. If I'm wrong, I'm glad I am.