He tottered under a heavy load.
他在重担下摇摇晃晃地走。
This involves testing the application under a heavy load and simulating various failure conditions.
这涉及在高负荷下测试应用程序并模拟各种失败情况。
I haven't been able to stress-test it though, but in times past it really suffered under a heavy load and got quite slow.
我不得不强调的是，原来那时候它加载很多东西并且获取非常缓慢。
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