golang-performance

Golang performance optimization patterns and methodology - if X bottleneck, then apply Y. Covers allocation reduction, CPU efficiency, memory layout, GC tuning, pooling, caching, and hot-path optimization. Use when profiling or benchmarks have identified a bottleneck and you need the right optimization pattern to fix it. Also use when performing performance code review to suggest improvements or benchmarks that could help identify quick performance gains. Not for measurement methodology (see golang-benchmark skill) or debugging workflow (see golang-troubleshooting skill).

0.97x

Quality

88%

Does it follow best practices?

Impact

84%

0.97x

Average score across 3 eval scenarios

Securityby

Passed

No known issues

Evaluation results

54%

-31%

Optimizing a Go Record Processing Pipeline

Iterative optimization workflow with benchmark documentation

Criteria

Without context

With context

Slice reuse pattern

100%

riskTags declared outside loop

100%

Direct indexing for results

33%

Code comment: slice reuse why

100%

37%

Code comment: direct indexing why

12%

Atomic benchmark

100%

Benchmem and count comment

100%

Baseline command in log

100%

One change at a time

100%

benchstat comparison command

100%

perf commit format

100%

98%

Adding Production Observability to a Go API Service

Production Prometheus observability and GC tuning for containerized Go service

Criteria

Without context

With context

Prometheus client package

100%

GOMEMLIMIT set

100%

83%

GC pause alert

90%

100%

Goroutine leak alert

100%

Memory limit alert

100%

GC frequency PromQL

90%

100%

Goroutine leak PromQL

100%

CPU saturation PromQL

87%

100%

Allocation regression PromQL

62%

100%

Worst-case GC pause PromQL

87%

100%

Threshold explanations

100%

20%

Building a High-Throughput Data Validation and Formatting Service

High-throughput validator: compiled patterns, template cache, lookup table, singleflight

Criteria

Without context

With context

Regexp at package level

100%

No per-call compilation

100%

Lookup table for CategoryPriority

100%

Template parsed once

100%

singleflight for cache miss

57%

100%

No global mutex serialization

60%

100%

singleflight sf.Do pattern

100%

summary.html template file

100%

ContainsProhibited multi-pattern

100%

Repository: Vonage/cloud-runtime-cli
Commit: 91034cc

Evaluated: 22 days ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Optimizing a Go Record Processing Pipeline Adding Production Observability to a Go API Service Building a High-Throughput Data Validation and Formatting Service

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