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devc1 wrote:Python is what makes you need to buy a 10000$ PC to run applications smoothly

There are plenty of applications that do so little processing Python is plenty fast. The ATM example by eekee is a good one, since the heavy stuff such as encryption or updating the UI is implemented in native libraries Python can load. Things like processing input normally takes very little work and can just as well be implemented in an easy to use language.

Usually, the right question to ask w.r.t. performance is not whether if something is fast, it's whether it is fast enough. Then, if the answer to that question is no, identify what is slow and only optimize that. It will save a lot of effort.