perf2000

[0.0.7] — 2026-05-28

Performance sweep

Measured improvements (see BENCH_BASELINE.md for full numbers). All
changes are bench-justified; deferred items are documented inline.

Backend (Rust)

• Tuned [profile.release] (lto=fat, codegen-units=1, opt-level=3,
  strip=symbols) for both workspaces; [profile.bench] inherits release.
• LoadedFile::distinct_keys switched to HashSet<&str> + Vec (O(N²) → O(N)
  in the inner loop).
• O(1) symbol lookup: name_index: HashMap<String, usize> on LoadedFile
  and GdxFile. ipc_common_symbols_19files: 287 ms → 25 ms (11×).
• Bounded LRU record cache (crates/gdxcomp-core/src/cache.rs,
  Mutex<LruCache<String, Arc<Vec<Rec>>>>) shared via Arc<RecordCache>
  across LoadedFile clones. Capacity from GDXCOMP_RECORD_CACHE_SIZE
  (default 32). build_view_aggregated_4files: 10.58 ms → 574 µs (18×).
• build_view, distinct_keys, YearMapper::new, read_param_map now
  iterate Arc<Vec<Rec>> directly — no per-call deep clone.
• New build_chart / build_table + commands get_chart_view /
  get_table_view. Chart-tab IPC payload −31% (3.77 ms vs 5.48 ms).

Frontend

• Switched plotly.js-dist-min → plotly.js-basic-dist-min. Bundle 4.86 MB
  → 1.30 MB (−73%).
• Vite manualChunks + React.lazy(ChartView) + Suspense. Main-entry JS
  4.86 MB → 159 kB (30×) for first paint; Plotly fetched in parallel
  when the chart tab activates.
• Lazy table fetch on tab switch (was: every setup change sent the full
  table). Cached client-side; invalidated on setup change.
• Skip chart refetch on mode-only toggle when the current symbol has no
  t dimension.
• Client-side distinctKeys cache by (symbol, dim), invalidated when
  the loaded-file set changes.
• Stable DataTable row keys so sort/filter doesn't churn React fibers.

Tooling

• Added BENCH_BASELINE.md with criterion median wall-clock for every
  bench; rows appended per phase, never overwritten.
• New crates/gdxcomp-core/benches/ipc_loopback.rs mirrors the Tauri
  command bodies (including serde_json::to_string).
• Extended load_and_view.rs with multi-file and pathological cases
  (4 / 19 files, largest-symbol, distinct-keys 19-files, aggregated builds).
• scripts/bundle-size.sh captures the frontend baseline.

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