I took advantage of the super sale on the Symphony option and upgraded to Media Composer 8.10.0 at the same time. I also upgraded to OSSierra 10.12.6 since Media Composer doesn't as yet support High Sierra. Since these upgrades my long form documentary project stutters terribly whenever I try to play in real time.  If I restart my Mac, it will then play normally for a short period of time and then begin to stutter again. My system is an iMac late 2013 3.1GHZ Core i7 16GB  NVIDA GeForce GT750M 1024MB.   When I was running MC 8.8 without Symphony and OSX 10.10 I never had this issue - it worked like a dream. 

RonBourke:

I also upgraded to OSSierra 10.12.6 since Media Composer doesn't as yet support High Sierra.

I don't know if this will make a difference to your issue or not, but MC works with High Sierra.

http://avid.force.com/pkb/articles/en_US/compatibility/en267087

That grid only goes up to 8.9.4. According to the 8.10 ReadMe, you can use up to High Sierra 10.13.2.

Hi Im running symphony on a MBP with pretty much the same specs and I have a feature loaded now and no stuttering at all. Have you tried rerendering after the new os ?

What warning colours are you getting on the timeline when it stutters?

Have you checked the speed of your drive connections? I  use Blackmagic disk speed test, and AJA have one too.

St.John

I've upgraded to High Sierra and for now all seems to be working just fine. Thanks for the suggestion!  I'm keeping my fingers crossed. - Ron