This is the intention. You want to be able to fine tune the execution speed of the animation. Let's look at the test and the results. Therefore I have a good amount of information about how the delay settings affect performance across platforms. As with all other tests, you can find this test in the test section .
Lets look at the results.
As you can see from these results, the performance is much more accurate across platforms, except Windows 98. At the different delay settings the target time is logically different. A 1ms delay means the animation should finish in about 1500ms. With a 10ms delay the target becomes 15000ms, and both the Linux and Windows NT systems match the target. With a delay setting of 1ms the result reflects the maximum performance of each system.