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  • Emulation overhead — No hardware acceleration in the WASM component. CPU-intensive workloads may run slower than native.
  • No GPU access — CUDA, Metal, and hardware ML accelerators are not yet available. Support may be added in the future with wasi-nn.
  • Env vars don’t cross between shell and Python — sandbox.commands.run("export FOO=bar") is not visible in sandbox.code.run(...). Use the filesystem to share data between the two.