Super Laggy Playback Makes Editing Impossible - Help!

Hey all. I just started using Premiere a couple of days ago (switched from FCPX). I got my audio and video synced with PluralEyes and enabled multicam. Now I am trying to go through and edit the multicam footage by pressing play and then selecting the appropriate camera by pressing 1 or 2, but the playback is frustratingly slow and laggy. It's so slow, I can't see where I am editing. Premiere is basically useless for me at the moment.
My video files are .mov files from a Canon Mark II and a Canon Mark III. The audio files are .wav files from a Zoom H4n. I'm using a late 2008 Unibody MacBook with a 2.4 GHz Intel Core 2 Duo processor, 8 GB 1067 MHz DDR3 memory, NVIDIA GeForce 9400M 256 MB graphics, and 250 GB storage. All my video and Premiere files are stored on a 500 GB Toshiba external hard drive. I know this computer isn't ideal for heavy video editing, but unfortunately, it's the only one I have right now. I'm hoping to upgrade this fall to a more powerful MacBook. In the meantime, is there anything I can do to make playback in Premiere work so that I can edit my video? I tried setting the Playback Resolution to 1/8, but that didn't seem to help at all.

Hi Meganslam,
My first guess is that your Mac is underpowered for your footage. Perhaps your hard drive is not adequate, as well. I'd first try moving the video files to your boot drive to see if that might be the issue. If you still have problems, you might try transcoding to another codec, say, ProRes 422 or ProRes LT with Adobe Media Encoder.
Thanks,
Kevin

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