Improve 3d model loading to avoid laggy browser

[seveibar]

I think it's an issue with the obj loader loading duplicate models (global model cache?)

Example project:
https://tscircuit.com/editor?snippet_id=22c651e7-a6d2-436d-b2b6-ba0b0921e95e

/bounty $5

[algora-pbc]

💎 $5 bounty • tscircuit

Steps to solve:

1. Start working: Comment /attempt #93 with your implementation plan
2. Submit work: Create a pull request including /claim #93 in the PR body to claim the bounty
3. Receive payment: 100% of the bounty is received 2-5 days post-reward. Make sure you are eligible for payouts

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