Similar story: shaving a 5 second build/run down to 200ms. It took 2-3 days to implement. I couldn't justify it in terms of time saved; nor did it <i>seem</i> I could use the article's justification that I'd tend to avoid compiling because it was too painful.<p>However, it <i>did</i> change my workflow, in that now I try things out quickly, and even using code like a config file, to test ideas instantly. Perhaps more importantly for me, every time I compile now I get a little feeling of delight, and a data-point suggesting that <i>all problems have solutions</i>.<p>details: <a href="http://news.ycombinator.com/item?id=939523" rel="nofollow">http://news.ycombinator.com/item?id=939523</a>