🔒 Covered by ReqProof — L3 Assurance (123 requirements, 0 errors, 0 warnings)
Performance — 6.1x large-payload speedup
Two optimizations found via ADHD-driven profiling + 10 parallel worktree experiments:
-
Fix stringEnd unbounded backslash scan —
stringEndConfigwas scanning the ENTIRE remaining parent document for backslashes instead of just the string body. Bounded todata[:firstQuote]. 128µs → 22µs (5.8x). -
SWAR string scan — replaced two separate
bytes.IndexBytecalls with a single inline 8-byte SWAR loop checking for both"and\simultaneously. 22µs → 21µs (additional 8%).
Fresh benchmarks (all libraries at latest versions)
Methodology: Apple M4 Max (ARM64), Go 1.26.3, median of 5 runs. All comparison libraries updated. The
encoding/jsonbenchmark no longer uses ffjson-generated methods (fixed #126 in v1.3.1).
| Payload | jsonparser | encoding/json | easyjson | jsonparser advantage |
|---|---|---|---|---|
| Small (190B) | 382 ns / 0 allocs | 1,335 ns / 9 allocs | 312 ns / 4 allocs | 3.5x faster, 0 allocs |
| Medium (2.4kB) | 3,894 ns / 0 allocs | 10,564 ns / 18 allocs | 2,444 ns / 7 allocs | 2.7x faster, 0 allocs |
| Large (24kB) | 20,788 ns / 0 allocs | 134,123 ns / 147 allocs | 32,765 ns / 134 allocs | 6.4x faster, 0 allocs |
jsonparser is the fastest library overall on large payloads and the only zero-allocation parser.
Full changelog: CHANGELOG.md