Extended algorithm crashes the sample app

[mbalajee]

Describe the bug
Extended algorithm (from this PR) drastically slows down the rendering. When I opt in to the extended algorithm the model which was loading fine before (if I don't opt in) takes a very very long time to load & it eventually crashes

To Reproduce
Steps to reproduce the behavior:
Follow this step to opt in to extended asset loader

Expected behavior
There should be no difference in performance

Screenshots

Left - Opt in to extended algo | Without extended algo

filament_old_new.mov

Desktop (please complete the following information):

• OS: Mac OS Sonoma
• Backend: Metal

Additional context
Load a larger model to reproduce the degrade in performance & an eventual crash. I couldn't attach the model here since it is sensitive but any larger model (> 8K entities) will be impacted

[poweifeng]

If you can point to a publicly available gltf with this issue, it'll help speed along the investigation. Also note that fixing any issues with the extended algo is not really prioritized at the moment since we really prefer to focus on exploring a better gltf loader overall.

[mbalajee]

If you can point to a publicly available gltf with this issue, it'll help speed along the investigation. Also note that fixing any issues with the extended algo is not really prioritized at the moment since we really prefer to focus on exploring a better gltf loader overall.

I'll try to find some online but any glb with over 8 to 10K entities will be affected

[mbalajee]

@pixelflinger @poweifeng In the extended asset loader, gltf buffer is loaded for every primitive which is causing this issue. When loaded just once, the issue is fixed. Can we pls fix this as this is a blocker for our release ? I can put up a PR if you would like, lemme know

@pirlande-fw