mapbox/tilemill — comment on commit f330e728dbd63b8d03c9b4680f0668be17fc94c4
File:  line 0
By jasonhoekstra:

@springmeyer - Only csv is great, it's an easy instruction for users to produce out of Excel. So doing a scan of the csvs on my drive (380 files, 2 years worth, all education and census data - some of these are revisions of the same file), 69 KB is the median, 3.3 MB is the average and 99 MB is the max.

We likely wouldn't map 103,000 points, but as a max use case, a commonly used file is the 2009-10 listing of geocoded public schools available at http://nces.ed.gov/ccd/pubschuniv.asp (100 MB unzipped). More likely would be 18,000 points, a 2009-10 listing of geocoded public school districts available at http://nces.ed.gov/ccd/pubagency.asp (6 MB unzipped).

Hope this helps -- happy to provide more info and testing (on a Mac) whenever you need it.