Editing the pose of a CC5 character inside of CC5 (e.g. moving the arm) takes less than 0.5 seconds to update.
Using the same character in iClone and making a single adjustment / adding a keyframe to the pose takes around 1.5 seconds.
In slightly more complex scenes even adding a single keyframe to a simple cube takes around 2 seconds.

Is this normal behaviour or are there ways to reduce the delay for adding keyframes in the timeline in iClone?

I tried to lower all the graphic settings, but it doesn't change anything. Playback works also fine and without any delay.