Any way to get multicam to work with HD?

I am using multi-cam mode in Premiere and it is essentially unusable because of lag.
I am presuming this is caused by a bottle-neck of the hard drive, as my system monitor is showing only 50% RAM usage and ~80% cpu.
I have tried everything i know to try to ease the process: only using multicam window (no preview/source), changing playback/pause resolution to 1/8th, closing all other programs, constantly saving and restarting, disabled multi monitor(only using one screen).
Still nothing is helping.
Is there anyway to prevent this lag?  Aside from building a better machine?
I am running 5 full hd cams, 2 of which are constant wide angles, so I dont need a preview of them (but still need to be able to select them in the mixdown).  Thought I could disable certain previews, but no idea if that is really an option.
Can i downsample the originals just for editing sake then revert to the full rez on render?
Can i pre render files? 
Can I close other things that are hurting my performance?
I think its rediculous this can't work in some fashion.  A project that should be done in real time is taking me 10x as long because I have to constantly pause and wait for the video to catch up.
Any ideas would be super helpful
I am running an i7 8 core, 8gb ram.  System drive is 120gb solid state, all media files on a seperate 450gb 7200 rpm.  Analysis files are on the solid state drive.

Thanks for the input everyone.  Through trial and error, I found a few useful tips I will share.
1st, you can disable any of the viewable streams, yet still retain the ability to click on them while doing a live mix.  You don't see the image (duh) but it my case this resolved the issue. 
I was doing a mix of 2 stationary cameras and 3 operated cams (recording a band live at a theatre), so I didn't need to preview the stationary cams.  I turned them both off in preview (the tiny eye in the setup sequence) which meant only displaying 3 streams instead of five.  I was able to use full playback resolution with no lag at all.
I also tried enabling 4 cams, which worked while reducing the playback qaulity to 1/8th, and this too seemed to work fine.  It seems im my case, 5+ streams is the limit.
This was 1920x1080 @ 60 frames.
Also based on my system monitor, RAM and CPU were not in any short supply.  I feel the issue lies in the HD or bus, but have no way to test this.
Anyway, thats it on my end.  Super stoked I can use this feature, it makes life so much easier.
On that same note, in my next computer build, I want a machine capable of handling more streams.  Any suggestions on the best RAID configuration when it comes to multi cam HD?  I am also curious to see if splitting the files onto an external drive(s) and the internal storage would make a difference.  Cheap hack, but if it works........

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