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A ramdisk is great, but in your case, you're limited to 1Gb of data. There's many Gb of data in the AT files. SSD works perfectly well for this.
Also, the tutorial shows 10 sec images being used. I generally use 5 sec ones, even from my light polluted backyard, and still get results (for my DSLR, I use ISO6400 or 25600 if I've gone insane or forgotten to change the setting :p ).
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