There is a noticeable difference in speed: Spark's orbitControl is much slower than MKK's GaussianSplats3D.

[cloris]

Using the same ply of SPLAT(about 2,878,840 splats) and default threejs Control three/addons/controls/OrbitControls.js, the performance difference is obvious: Spark's orbitControl is much slower than MKK's GaussianSplats3D.

[mrxz]

It's unclear to me what the relevance of the OrbitControls is when comparing performance. Just to be sure, you aren't talking about the movement speed of the camera/controls nor using OrbitControls for rendering on demand, right?

There are many factors that influence performance, so it would help if you could provide:

• Device used (including which GPU)
• Browser + version
• Spark version

And ideally provide a runnable example with the .ply in question or a substitute that exhibits the same issue.

Worth pointing out that Spark does the spherical harmonics and sorting asynchronous to the rendering. This means that large camera movements/rotations might show incorrect rendering results for a few frames. Especially on mobile GPUs (tile-based) in smartphones or Apple M series devices this sorting tends to take longer. See #205 (comment)

Using an FPS counter should tell you whether your scene is rendering at a lower rate or not.

[cloris]

@mrxz Thanks your feedback. I used Windows 11 PC (12th Gen Intel(R) Core(TM) i7-12700H 2.30 GHz 4GB GPU), Chrome 141.0.7390.123, Spark "@sparkjsdev/spark": "^0.1.10", and render continuously. Ply size is 1.288GB, splats count is 18,942,182. I recorded comparison videos — one with Spark and one with Mkk, FPS is shown in the left-top corner. Spark performance is noticeably lower than Mkk's

Spark
https://github.com/user-attachments/assets/46a3396b-77ab-4894-aec6-39f013030330

Mkk
https://github.com/user-attachments/assets/97434200-61ed-48ba-bda5-4d1bcb1aef80

.