FPS fluctuation on 4.2.1 but not on 4.1.11

[Alvis_Cortex]

I had a gig last weekend and my FPS was fluctuating quite a lot even when I did not have much happening on my composition so I had a 10hs gig on Sat and Sunday and I was limited on how much I could do.

So today I tried to replicate the problem and for my surprise it is still happening even when there is nothing being played on my comp and after lots of tests it seems that the problem starts once I select an output - whether it is the 'Full Screen' or the 'Advanced Output' option on Arena.
If I have nothing being played on my comp the FPS jumps from 60 to 52 to 43 to 29 and back to 60 (loop) but If I disable the output the FPS goes back to 60 and it stays around there.

But the weird thing is that it only happens when I am using either Arena 4.2.1 or 4.2. Once I open the same comp with the same 'Advanced Screen Setup preset' in 4.1.11 it all works fine. I have no other apps running.

Any thoughts?

Thanks

Setup:
MBP Late 2008
2.53 GHz Intel Core 2 Duo
8Gb
Graphics NVIDIA GeForce 9600M 512Mb
SSD
OSX Yosemite
DXV3

[Alvis_Cortex]

No one facing a similar problem?

Or any suggestions on how to solve this?

Is it possible that my machine is the problem? even though I have a perfect composition running on 4.1.11?

Thanks

[AdevProjects]

You could try turning vsync off in your graphics driver control panel. Im a windows user so I dont know how that would be done on OSX.

[Alvis_Cortex]

You could try turning vsync off

Thanks for your suggestion t13swift, I had never heard of Vsync before. It is called Beam Sync on a mac and it can be turned off using 'Quartz Debug'

I did try that and in a way it does work (I got an amazing 130FPS) but it causes screen tearing so it is not a feasible solution.

I would love to hear from the Resolume guys if they have any suggestions. I don't know what else to do to try to fix this. I will have to render all me library back to DXV2 and get stuck on 4.1.11.

Cheers

[Joris]

We did do some work with VSync in the 4.2 release, primarily to try to improve problems people had on Mavericks.

To be honest, I don't know if and/or why that would cause problems for you.

On the other hand, you're working with a 7 year old laptop, so it could be that Apple's new drivers on Yosemite cause problems for that particular GPU. I'm actually surprised you can run Yosemite on that machine at all.

[SystemD]

hello,

I have the same machine with 10.8.5 and i have noticed the same problems .