Mac OSX Mojave and Computrainer

I recently updated my Macbook Pro to OSX Mojave. Now, the Zwift frame rate has gone down to less than 1 FPS. the game freezes for a second or two almost every other second.

My trainer is a Computrainer. The setup was working very well until the Mojave update was installed.

Anyone else encounter this?

I had the issue but not as drastic as you. problem solved below…See link

Thanks for the suggestion, @CamK. However, my macbook pro does not have dual graphics cards, and that option is already turned off (unchecked). I’m re-installing to see if that makes any difference.

Hey John, any updates? Do you know if there were any new programs running in the background that might have affected the frame rate?

I have made sure nothing is running in the background.

The problem is more than just a low frame rate - the program ‘hangs’ for a second or two about every 3~4 seconds. My USB connection to the computrainer has lights that blinks when communication is occuring. With a normally running Zwift session, the blinks are rapid and continuous. Now, on OSX Mojave, the blinking pauses along with the observed program hangs.

I’ve made sure the correct USB drivers are installed/active. Right now I’m just putting this down to Mojave/USB wierdness. At least I have another computer to use (an older macbook pro), wich is not as good as the one I installed Mojave on, but it’s workable.

If I load up Zwift and choose to just watch (no connections to sensors), Zwift behaves with a normal frame rate, so I know it has something to do with the USB connections.

John, did you ever figure this problem out? I’m having the same issue with my CompuTrainer. I thought it was the DIN cable so I replaced it but the video is still very choppy.

Hey @Kevin_Gilmore have you tried turning off automatic GPU switching?

Vincent, yes, I tried that early on but it made no difference for me. Still the same choppy video.


Hi Vincent,

Yes, that was one of the first things I tried but it made no difference for me. I still have the same choppy video.


Also experiencing single-digits FPS & really poor performance on a 2018 Macbook Pro which should be getting 30+fps with no real reason for it

I am having the same issue after downloading the latest version of zwift to my Mac with OS Mojave. Choppy, halting video. The tech guys in my office said I would need to buy a new computer with a better graphics card. There has to be a better solution. Is it possible for zwift to make available the earlier version for download??


I’ve got a similar issue.
MacOS Mojave running on a 2018MBP.
I’ve got small graphic lags in Zwift (screen “freezes” for about half a second) from time to time and I get one every time I’m moving the mouse.
Never had issues like this with older MacOS versions so I think it’s caused by Mojave (and for the records: doesn’t matter if the automatic GPU switching is en-/disabled) but maybe a workaround or fix could be implemented within Zwift…

Same issue here, tried uninstalling FTDI drivers and using only the Apple driver but no improvement.
So now Zwift fails on my MBP on both OSX (freezing video) and Win 10 (won’t start, white screen, suspect video driver does not like the Radeon graphics card).
Still using my 2013 MBP for Zwifting…

I ended up having to ditch the Computrainer. I purchased a Certified factory reconditioned Wahoo Kickr from Wahoo. Runs fine on the same Mac that had issues with the Computrainer?
Anyone interested in a used Computrainer? No Problems with it, I just didn’t have the right computer equipment to run Zwift successfully after that update.