— in class definition

       [DllImport("KERNEL32.DLL", EntryPoint = "SetProcessWorkingSetSize", SetLastError = true, CallingConvention = CallingConvention.StdCall)]
       internal static extern bool SetProcessWorkingSetSize(IntPtr pProcess, int dwMinimumWorkingSetSize, int dwMaximumWorkingSetSize);

       [DllImport("KERNEL32.DLL", EntryPoint = "GetCurrentProcess", SetLastError = true, CallingConvention = CallingConvention.StdCall)]
       internal static extern IntPtr GetCurrentProcess();

— code to call when you want to reduce the memory

       IntPtr pHandle = GetCurrentProcess();
       SetProcessWorkingSetSize(pHandle, -1, -1);

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