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By default Boot Camp will configure Windows to use 144 DPI. This is a good default because it strikes a balance between making UI elements large enough to be usable, while still staying within the “supported” realm of mainstream Windows software. By this, what I mean is that up until recently (at least at Microsoft) it was a given to make sure applications worked well at 125% and 150% DPI scaling, but 200% scaling has been less tested and is also less likely to have icons and other art that natively scales to that setting.
For reasonably advanced users I recommend enabling “Use Windows XP style scaling” under the “Custom sizing options”. This prevents the OS from using the DWM to use bitmap stretching on the application to make everything bigger at the expense of quality.
For Internet Explorer 10 I bump the zoom factor to 200% (192 DPI) for most casual web surfing. This gives a very comfortable text size while eliminating wasted space. Text is incredibly sharp, well-defined, and readable. There is no longer any concern over respecting the font vs. respecting the pixel grid. Images look blurry in comparison, but unlike at ~120 DPI it’s an acceptable trade-off, and they don’t look worse than they would if I were running at a lower resolution.