[racket] Performance. How to disable contract checks?

 Is there a way to disable all contract checks? 

Suppose, I debugged my program and sure that it is reliable. I disable debugging, but as I understand, contracts are still checked in every function.
But I want to maximize the performance of my program. Is there a way to do that or I have to manually hack racket/contract/base to do that?


-- 
Roman Klochkov
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