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You can only do so much with hardware. A good video card is essential, as is a fast hard drive with enough free space for virtual memory (I would recommend at least 15 times the file size) What is this guy doing with 50 MB files? I work with 3D topographic/survey files covering up tp 500 acres (sometimes more), and the biggest files I work on are almost always under 10 MB - usually around 5 or 6..
Tell the guy to learn how to xref files instead of inserting them - if he's got everything on one file, that will really slow down AutoCAD. Also, the view resolution can really slow down screen refreshes. I work with curvilinear polylines, so I need mine set at around 3000, but 200 is fine for orthographic features. Also, ask him what kind of hatching he's using - hatches can triple a file size very rapidly. There's also the obvious - freeze unnecessary layers, and regularly purge your files of unused blocks. layers, etc.
Something is causing him to have unusually large files - I only go over 10MB if I insert large raster files - like aerial photos. And if I do that, I'll leave that layer frozen until I need it.
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If you want to avoid 95% of internet spelling errors:
"If your ridiculous pants are too loose, you're definitely going to lose them. Tell your two loser friends over there that they're going to lose theirs, too."
It won't hurt your fashion sense, either.
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