As edge cloud computing environments develop and become practical, research on offloading to solve complex operations in low-performance devices is also actively underway. Offloading method is mainly used to solve the performance problem for IoT devices. Offloading tasks to high-performed servers needs synchronization that results in blocking clients. In this paper, we present an asynchronous method between client devices and servers when offloading occurs. The proposed method is to reorder expressions with variables that have dependencies when offloading on a function-by-function basis. This method can minimize the amount of time it takes client devices and improve the performance of virtual machines.