In CC 1.50 I get very low FPS in fullscreen, but it does not show up in the FPS counter, changing resolution does not help, any ideas why this is happening?. Oops I mean Cortex Command 1.05, not 1.50 lol.

Are you using mods? Some of the changes in 1.05 to the AI architecture are playing absolute hell with mods causing scripting related lag.

No I am not using any mods.

It's not cortex command.
It sounds like something wrong with your computer's hardware.

If you posted a video of this, we'll have more viable evidence and support to figure out how to fix this problem.
I know what I'm talking about, I have over a thousand posts.

I have no way of posting a video , but here's how it happens. I open Cortex Command 1.05, in windowed mode, FPS is smooth and normal. I switch to fullscreen and it slows down horribly, but if I check the FPS counter it still shows my normal FPS, and does not recognize the slowdown at all.
I switch over to 1.0, and I get my normal 100+ FPS, no matter the screen setting.

Is anyone else having this issue with CC 1.05 on the Mac?, to me it seems like an issue with the game, as version 1.0 works fine on my Mac.

Yes. Same situation here. Windowed is OK, and when playng in fullscreen it gets laggy. From the start. Even mouse cursor starts jumping... No mods, etc. 10.8.2 clean install few days ago. Lets just wait for v1.1

And its not laggy i.e. "struggling CPU" vise, as musch as its just choppy visually.

Thanks for the reply, yeah it does seem like a coding issue.