The debate is no longer about syntax preference; it is about the cost of tail latency versus the cost of developer hours. In 2025, the industry default is Go for its incredible "time-to-market" velocity. However, as systems mature and throughput scales to millions of requests per second (RPS), Go's garbage collector (GC)—despite massive improvements—becomes a non-negotiable ceiling on p99 latency consistency. The architectural decision matrix today is specific: Use Go to map the territory; use Rust to pave the highway. The Root Cause: Allocation Patterns vs. The Borrow Checker The friction arises from how these languages manage memory under high load. Go: The throughput-optimized GC Go uses a concurrent, tri-color mark-and-sweep garbage collector. It is optimized for low pause times, but it is not free. Escape Analysis Limitations: If the Go compiler cannot prove a variable stays on the stack (e.g., returning a pointer to a struct, using interfaces), it escapes to the...
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