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Large scale loosely coupled PCs can organize clusters and form the grid computing on sharing each processing power; power of PCs and code migration characterize the performance of distributed systems. This paper describes the performance evaluation of large scale loosely coupled distributed systems. The prototype of the middleware which migrates objects for computing is implemented, and the trade-off of the migration against computing was observed. Based on these experiments, several simulations for large scale loosely coupled PC clusters were performed, and the properties of the PC clusters for object migration are derived. These results will well be applied to design the grid computing systems to continuously maintain the proper performance.