When IBM used to install a new mainframe computer, they would throttle it to keep the speed down.
With only few users migrated to it, it would be amazingly faster than the previous computer, but as more users were migrated, it would only become much faster. The early migrators would start complaining about how slow the new computer had gotten rather than remembering that what they had now was still much faster.
They figured out that by throttling it for light loads, and opening it up when more users were added, everyone felt the new computer was faster and stayed happy.