The GridAxis animation for charts is stuttering

In the Charts for Widgets Gallery example, in the "Chart Themes" page, the animation for the grid, "GridAxis Animations", stutters very noticeably. The animation for the series, "Series Animations", works perfectly fine alone without any stuttering, but when used together with the grid animation using "All Animations", the series animation will also stutter together with the grid animation.

The stuttering is worst in 6.7.0.

Steps to reproduce:

1. Go to the "Chart Themes" page.
2. Choose "GridAxis Animations" as the current animation.
3. Change the position of Legend between all the possible positions: top, right, bottom, left. Notice that the grid animation stutters.
4. Repeat step 2 and step 3, but this time using "Series Animations". Notice that it does not stutter, and that the animation is smooth.
5. Repeat step 2 and step 3, but this time using "All Animations". Notice that the grid animation and the series animation will both stutter.

Expected behavior:

The animation should be smooth without any stuttering.