I am having a similar issue, it seams it could be an issue with the pipeline my 3D artist is using as some of their assets are crashing gltf.report while some old assets aren't. The asset I am trying to load is being exported from Maya and has bone animations. can't share the asset, but I can share the error I am getting as well as the details of vertices.

pd: thanks for this tool, has save my life so many times.

I have just had the site crash with a glb - it's using a lot pf instancing (5k). The file opens without any problem on https://gltf-viewer.donmccurdy.com/ but on https://gltf.report/ the file opens (I can see it) but hangs the site whenever I try to interact with it.

Hi Mal, thanks for the report! Does this model also crash in https://gltf-viewer.donmccurdy.com/ for you? It works in both viewers for me, but this might just be a difference in our computers.

I'll look into what could be done here, but 20,000 draw calls is definitely on the more complex side. :)

In the meantime you may have better luck optimizing this with the CLI first. I tested that out, it runs fine, but there are a few visual bugs after optimization (which would also occur if this were running in glTF Report). I've filed an issue for that here: