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We repeat many peers each time we call SetPeers. Instead of constructing strings for them from scratch every time, keep strings alive across iterations. name old time/op new time/op delta SetPeers-8 3.58µs ± 1% 2.41µs ± 1% -32.60% (p=0.000 n=9+10) name old alloc/op new alloc/op delta SetPeers-8 2.53kB ± 0% 1.30kB ± 0% -48.73% (p=0.000 n=10+10) name old allocs/op new allocs/op delta SetPeers-8 99.0 ± 0% 16.0 ± 0% -83.84% (p=0.000 n=10+10) We could reduce alloc/op 12% and allocs/op 23% if strs had type map[string]strCache instead of map[string]*strCache, but that wipes out the execution time impact. Given that re-use is the most common scenario, let's optimize for it. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>