Video taken off of my iPhone X plays back on my MacBook choppy

I started taking some videos on my iPhone X (4k Quality) to throw onto my macbook and edit on Final Cut Pro X.

When i go to playback my video on my macbook the payback is extremly choppy.

So i have a 2011 MacBook Pro. The specs are:

MacBook Pro (15-inch, Early 2011)
Processor: 2 GHz Intel Core i7
Memory: 16 GB 1600 MHz DDR3
raphics: AMD Radeon HD 6490M 256 MB
Intel HD Graphics 3000 512 MB

I transfered the same video to a 2016 Macbook Pro, and to my surprise the playback was smooth. The Macbooks specs are:

MacBook Pro (13-Inch, 2016)
Processor: 2 GHz Intel Core i5
Memory: 8GB 1867 MHz LPDDR3
Graphics: Intel Iris Graphics 540 1536

Not sure if anyone here can help me pinpoint the problem.

I'd say the problem is your Macbook. 4K is demanding enough for a lot of pretty high end computers.

If you really want to edit 4k video smoothly on a laptop, you'll need to upgrade to a modern one.

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