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performance-security tradeoff

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Sidecars provide 3x faster cross-boundary communication in the stated comparison

IN CONTEXTperformance-security tradeoff1 viewpoints
2026-10-01

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Sidecars provide 3x faster cross-boundary communication in the stated comparison

Johnston describes Sidecars as isolated containers that run alongside a main Sandbox on the same host. She reports 3x faster communication across trust boundaries than using separate Sandboxes, particularly for operation-heavy workloads.

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Supporting evidence

Sidecars: A low-latency trust boundary for Sandboxes | Modal Blog

Original excerpt

Sidecars enable 3x faster communication across trust boundaries than using separate Sandboxes — which is particularly helpful for operation-heavy workloads.
Context

Today we’re excited to introduce Sidecars, which are our broader answer to this problem. Sidecars are isolated containers that run alongside your main Sandbox on the same host and provide a real security boundary between trusted or untrusted code.

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