So, on a fairly heavily loaded machine, you get to wait for every device to probe twice.
The truck was heavily loaded.
All those heavy database operations will certainly put extra loads on this already heavily loaded instance and would easily cause some performance problems.
Because the widget's animation places little demand on the processor, we can be confident that it will run smoothly even when the processor is heavily loaded with other activity.
Students are heavily loaded with school work, and only have limited time for extra-curricular reading. They hope the reading and writing are related to the classroom teaching contents.