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People waste a huge amount of time on performance improvements
Here's a more common situation
A programmer is assigned to make program X faster
The programmer spends a week on the project
The programmer's salary is US$65,000 per year
Cost of project: $2,600 (counting overhead, benefits, etc.)
Compare this cost with the cost of buying another Gb of memory
Or a really hot CPU upgrade
Or a second server
Often, the hardware purchase is a lot more cost-effective
It is also more likely to be successful
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