Garbage collected languages like Go will always have worse performance than lower level languages like C (frr and bird are implemented in C).
replyGobgp is great if you want to embed it directly into a Go app though. Talos Linux has done that recently.
No they won't. They are generally faster in throughput than any non-gc application that isn't heavily hand optimized. Their problems are higher memory usage and unpredictable latency, not speed.
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