How to force Premiere to render previews?

Hi, everyone. I have a clip that's high definition. It's been video denoised and colour corrected and vignetted, and to preserve quality it's rendered in QuickTime Animation codec with quality of 100 (lossless). It's 37 gigabytes for 3 and a half minutes, and my humble MacBook Pro can't play it in real time. That's no problem, as long as I can use previews to do my editing.
But it looks like Premiere Pro CS 6.0.1 is trying to use the original file instead of creating previews. If I delete all preview files, the line above the clip stays yellow/green (I'm colour blind, sorry I can't tell the difference). If I drop the sequence preview resolution, it stays yellow/green.
I want the original footage for quality, but I want to edit using something lossy. How do I force Premiere to make a low-bitrate version of the file for preview purposes?
Richard

UT doesn't lose any quality and niether does Lagarith. Both of these codecs are 100% lossless. DNxHD is visually lossless which I have done many many test with and I haven't ever seen any loss with it. But honestly I was just trying to recommend you consider using one of the codecs I mentioned instead of Animation beause Animation takes forever to render and also produces HUGE files and it doesn't produce any better results than UT or Lagarith, and for all intensive purposes doesn't look any better than DNxHD either (since it's visually lossless).
Also with Lagarith and UT and DNxHD you probably wouldn't need to render to begin with. (depending on what you're doing) but since you've been using animation already I understand if that's what you'd continue to like using I actually used to use Animation and PNG back before I found out about the options I have listed.

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Complete name                    : K:\final\1 Introductory\3 Tree Run.avi
Format                           : AVI
Format/Info                      : Audio Video Interleave
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ID                               : 0
Format                           : JPEG
Codec ID                         : MJPG
Duration                         : 7s 567ms
Bit rate                         : 60.7 Mbps
Width                            : 1 280 pixels
Height                           : 720 pixels
Display aspect ratio             : 16:9
Frame rate                       : 60.000 fps
Color space                      : YUV
Chroma subsampling               : 4:2:2
Bit depth                        : 8 bits
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Bits/(Pixel*Frame)               : 1.098
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ID                               : 1
Format                           : PCM
Format settings, Endianness      : Little
Format settings, Sign            : Signed
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