Quite by chance I have just watched a Vimeo clip - https://vimeo.com/blog/post/video-101-editing-basics - running on El Capitan on a MacBook Pro - which I updated from Mountain Lion a month or two back.
I still use Snow Leopard on one of my machines, but I have noticed with some machines that the "wheels start to drop off" if some applications are used on old versions of OS X. I would suggest that it might be worth doing an upgrade. What might help you is to have a spare hard drive on which to download or install new versions. You don't actually have to carry out the upgrade on your machine if you decide not to, but at least by doing the download each OS version will appear in your Purchases list, so you can get back to them if you decide you want to/need to.
If you haven't done this, you will only be able to go straight to Sierra - though I have tried that and I didn't spot any really major problems, but i've just not completed the installation of that system on the machines which currently run El C.
I suspect if you do the upgrade to Sierra, which might take an hour or so, that your Vimeo problems will go away. If you don't actually need any specific software which runs on your current OS versions you might just as well do that - though you should backup (maybe Carbon Copy Cloner) and take as many sensible precautions as are generally recommended.
I still use Snow Leopard on one of my machines, but I have noticed with some machines that the "wheels start to drop off" if some applications are used on old versions of OS X. I would suggest that it might be worth doing an upgrade. What might help you is to have a spare hard drive on which to download or install new versions. You don't actually have to carry out the upgrade on your machine if you decide not to, but at least by doing the download each OS version will appear in your Purchases list, so you can get back to them if you decide you want to/need to.
If you haven't done this, you will only be able to go straight to Sierra - though I have tried that and I didn't spot any really major problems, but i've just not completed the installation of that system on the machines which currently run El C.
I suspect if you do the upgrade to Sierra, which might take an hour or so, that your Vimeo problems will go away. If you don't actually need any specific software which runs on your current OS versions you might just as well do that - though you should backup (maybe Carbon Copy Cloner) and take as many sensible precautions as are generally recommended.
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