Some applications are still more capable of creating load than others. Games are a good example of ones that are not, because the available calculations are limited, and while performance improves with more resources available, after a point, it becomes diminishing returns. Also, while there is a limit of instruction rate determined by the architecture and clock cycle, which instructions are in use will affect load based on the architecture, for the same reasons above - if the number of instructions are the same, ones that take more clocks to perform will result in a greater load.
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