By default, viewport
animations play in real time, skipping frames where necessary.
You can turn this off
by clicking Time Configuration in the time controls, and then turning
off Real Time in the Playback group box of the
When Real Time is turned
off, all frames are displayed during playback. The playback may
appear slow, but you'll know that you're seeing every frame.
You can also speed viewport
animation by minimizing your viewports to quarter size.