How to make UI animation feel smoother in After Effects

Fix stiff UI animation by adjusting its timing, easing, and layer sequence separately.

• You will: Refine a UI entrance with clearer acceleration and coordinated timing.

• Prerequisites: macOS or Windows, MotionUI, After Effects, a composition with separate UI layers

How do you fix stiff UI animation in After Effects?

Step 1: Open your composition in After Effects

Start with the MotionUI app and access plugin setup from the app if you haven't connected your tools. MotionUI is a desktop app for macOS and Windows by HIVER connecting Figma, After Effects, Claude Code and Codex.

For this exercise, open an After Effects composition containing a vertical stack of UI cards on separate layers. If your design starts in Figma, MotionUI supports direct Figma to After Effects import. Claude Code or Codex control of Figma and After Effects is also available, but this exercise uses the animation controls directly.

Expected result: You can select individual card layers and inspect their animation keyframes in the After Effects timeline.

Step 2: Preview and identify what feels wrong

Preview the entrance before editing it. Watch the start, the finish, and the relationship between the cards. Identify the part you want to change before choosing a curve.

Timing is when movement happens and how long it takes. Keyframe spacing determines the time between animated values. Easing controls how movement accelerates and slows down within that time. A sequence offsets related layers so their movements happen in order.

• Stiff start: Watch whether the card jumps into movement or takes too long to get going. Use that observation to guide the curve adjustment.

• Floaty finish: Watch whether the card spends too much of its entrance creeping toward its final position. Check both the curve and keyframe spacing.

• Everything moves at once: Adjust the sequence rather than expecting an easing change to create a stagger.

Expected result: You have a specific editing target, such as a softer start or a shorter settling phase.

Step 3: Establish the entrance and its timing

For the card example, select the layers and open the Animate tab. Under Settings, choose a duration and In, then click Slide Up. If you already have an entrance you want to keep, work with its existing keys instead.

Preview the movement. If the whole entrance takes too long, bring its start and end keyframes closer together in After Effects. If it feels rushed, spread them farther apart. Leave the curve unchanged during this pass so you can judge timing alone.

Expected result: The entrance has a workable duration, even if its acceleration still needs refinement.

Step 4: Apply easing to the selected keyframes

Select the keyframes you want to change in the After Effects timeline. Open Easing in MotionUI. Pick a preset curve or drag the curve handles, then click Apply Easing to Keys.

For an abrupt start, adjust the curve toward a more gradual acceleration and preview again. If the start hesitates instead, adjust toward a more immediate departure. For a floaty finish, try reducing the prolonged slowdown while keeping the keyframe spacing unchanged.

Select the keyframes, not only the layer. MotionUI applies easing to the selected keys in the timeline.

Change the curve incrementally and compare previews. The MotionUI easing instructions document this selection, adjustment, and application workflow.

Expected result: The same movement starts and settles with a feel closer to your intended interaction.

Step 5: Stagger the card entrances

To build a sequenced version of the card entrance, enable Apply to multiple layers in Animate. Choose a direction and delay, select the card layers, and apply the preset.

MotionUI bases sequence order on the layers' positions on screen. Choose a direction that follows the visual arrangement, then use the sequence adjustments to tighten or spread the stagger. Follow the entrance and sequence instructions for this workflow.

Expected result: The cards enter in a visible order. Preview the generated animation and refine its easing as needed.

Step 6: Compare the complete entrance

Compare your revised composition with the initial preview. In this example, the before version has cards moving together, an abrupt departure, and a lingering finish. The intended after version has a controlled departure, less lingering, and an ordered entrance.

Check the complete sequence as well as individual cards. If the group still takes too long, tighten the stagger before changing every card's curve. A strong ease can feel different on a long move than on a short UI transition.

Expected result: You can explain each improvement as a timing, easing, or sequence change.

Troubleshooting: What should you check if motion still feels wrong?

• Easing changes nothing: Select the actual timeline keyframes, then click Apply Easing to Keys again.

• The finish still floats: Check keyframe spacing as well as the slowdown curve. Preview after changing each separately.

• The sequence order is unexpected: Check screen positions and the chosen direction, then refine the sequence.

• Individual cards feel right, but the group drags: Tighten the stagger with the sequence adjustments and preview the entire entrance.

Need to set up the app first? Follow the MotionUI setup guide for Mac and Windows.