Perf/throughput pass (5/8)

Cargo.toml

@@ -25,46 +25,45 @@ path = "src/cli/main.rs"
 required-features = ["cli"]
 
 [features]
-default = ["cli"]
-cli = [
-    "dep:clap",
-    "dep:anyhow",
-    "dep:tiktoken-rs",
-    "dep:comfy-table",
-    "dep:ratatui",
-    "dep:crossterm",
-    "dep:tui-textarea",
-    "dep:arboard",
-    "dep:syntect",
-    "dep:unicode-width",
-    "dep:chrono",
-]
+default = ["cli", "cli-stats", "tui", "tui-clipboard", "tui-time", "parallel"]
+cli = ["dep:clap", "dep:anyhow"]
+cli-stats = ["cli", "dep:tiktoken-rs", "dep:comfy-table"]
+tui = ["dep:anyhow", "dep:ratatui", "dep:crossterm", "dep:tui-textarea"]
+tui-clipboard = ["tui", "dep:arboard"]
+tui-time = ["tui", "dep:chrono"]
+parallel = ["dep:rayon"]
 
 [dependencies]
 serde = { version = "1.0.228", features = ["derive"] }
 indexmap = "2.0"
 serde_json = { version = "1.0.145", features = ["preserve_order"] }
 thiserror = "2.0.17"
+itoa = "1.0"
+ryu = "1.0"
+rayon = { version = "1.10", optional = true }
 
-# CLI dependencies (gated behind "cli" feature)
+# CLI dependencies (gated behind "cli"/"cli-stats" features)
 clap = { version = "4.5.11", features = ["derive"], optional = true }
 anyhow = { version = "1.0.86", optional = true }
 tiktoken-rs = { version = "0.9.1", optional = true }
 comfy-table = { version = "7.1", optional = true }
 
-# TUI dependencies (gated behind "cli" feature)
+# TUI dependencies (gated behind "tui" feature)
 ratatui = { version = "0.29", optional = true }
 crossterm = { version = "0.28", optional = true }
 tui-textarea = { version = "0.7", optional = true }
 arboard = { version = "3.4", optional = true }
-syntect = { version = "5.2", optional = true }
-unicode-width = { version = "0.2", optional = true }
 chrono = { version = "0.4", optional = true }
 
 [dev-dependencies]
 datatest-stable = "0.3.3"
 glob = "0.3"
+criterion = "0.5"
 
 [[test]]
 name = "spec_fixtures"
 harness = false
+
+[[bench]]
+name = "encode_decode"
+harness = false

README.md

@@ -39,6 +39,25 @@ users[2]{id,name}:
 - **Strict Validation**: Enforces all spec rules (configurable)
 - **Well-Tested**: Comprehensive test suite with unit tests, spec fixtures, and real-world scenarios
 
+## Performance Snapshot (Criterion)
+
+Snapshot from commit `f5b1b7e` using:
+`cargo bench --bench encode_decode -- --save-baseline current --noplot`
+
+| Benchmark | Median |
+| --- | --- |
+| `tabular/encode/128` | 145.81 us |
+| `tabular/decode/128` | 115.51 us |
+| `tabular/encode/1024` | 1.2059 ms |
+| `tabular/decode/1024` | 949.65 us |
+| `deep_object/encode/32` | 11.766 us |
+| `deep_object/decode/32` | 10.930 us |
+| `deep_object/encode/128` | 46.867 us |
+| `deep_object/decode/128` | 49.468 us |
+| `decode_long_unquoted` | 10.554 us |
+
+Numbers vary by machine; use Criterion baselines to compare before/after changes.
+
 ## Installation
 
 ### As a Library
@@ -53,6 +72,22 @@ cargo add toon-format
 cargo install toon-format
 ```
 
+### Feature Flags
+
+By default, all CLI/TUI features are enabled. You can opt in to only what you need:
+
+```toml
+toon-format = { version = "0.4", default-features = false }
+```
+
+```bash
+cargo install toon-format --no-default-features --features cli
+cargo install toon-format --no-default-features --features cli,cli-stats
+cargo install toon-format --no-default-features --features cli,tui,tui-clipboard,tui-time
+```
+
+Feature summary: `cli`, `cli-stats`, `tui`, `tui-clipboard`, `tui-time`, `parallel`.
+
 ---
 
 ## Library Usage

benches/encode_decode.rs

@@ -0,0 +1,92 @@
+use criterion::{black_box, criterion_group, criterion_main, BenchmarkId, Criterion};
+use serde_json::{json, Value};
+use toon_format::{decode_default, encode_default};
+
+fn make_tabular(rows: usize) -> Value {
+    let mut items = Vec::with_capacity(rows);
+    for i in 0..rows {
+        items.push(json!({
+            "id": i,
+            "name": format!("User_{i}"),
+            "score": i * 2,
+            "active": i % 2 == 0,
+            "tag": format!("tag{i}"),
+        }));
+    }
+    Value::Array(items)
+}
+
+fn make_deep_object(depth: usize) -> Value {
+    let mut value = json!({
+        "leaf": "value",
+        "count": 1,
+    });
+
+    for i in 0..depth {
+        value = json!({
+            format!("level_{i}"): value,
+        });
+    }
+
+    value
+}
+
+fn make_long_unquoted(words: usize) -> String {
+    let mut parts = Vec::with_capacity(words);
+    for i in 0..words {
+        parts.push(format!("word{i}"));
+    }
+    parts.join(" ")
+}
+
+fn bench_tabular(c: &mut Criterion) {
+    let mut group = c.benchmark_group("tabular");
+    for rows in [128_usize, 1024] {
+        let value = make_tabular(rows);
+        let toon = encode_default(&value).expect("encode tabular");
+
+        group.bench_with_input(BenchmarkId::new("encode", rows), &value, |b, val| {
+            b.iter(|| encode_default(black_box(val)).expect("encode tabular"));
+        });
+
+        group.bench_with_input(BenchmarkId::new("decode", rows), &toon, |b, input| {
+            b.iter(|| decode_default::<Value>(black_box(input)).expect("decode tabular"));
+        });
+    }
+    group.finish();
+}
+
+fn bench_deep_object(c: &mut Criterion) {
+    let mut group = c.benchmark_group("deep_object");
+    for depth in [32_usize, 128] {
+        let value = make_deep_object(depth);
+        let toon = encode_default(&value).expect("encode deep object");
+
+        group.bench_with_input(BenchmarkId::new("encode", depth), &value, |b, val| {
+            b.iter(|| encode_default(black_box(val)).expect("encode deep object"));
+        });
+
+        group.bench_with_input(BenchmarkId::new("decode", depth), &toon, |b, input| {
+            b.iter(|| decode_default::<Value>(black_box(input)).expect("decode deep object"));
+        });
+    }
+    group.finish();
+}
+
+fn bench_long_unquoted(c: &mut Criterion) {
+    let words = 512;
+    let long_value = make_long_unquoted(words);
+    let toon = format!("value: {long_value}");
+
+    c.bench_function("decode_long_unquoted", |b| {
+        b.iter(|| decode_default::<Value>(black_box(&toon)).expect("decode long unquoted"));
+    });
+}
+
+criterion_group!(
+    benches,
+    bench_tabular,
+    bench_deep_object,
+    bench_long_unquoted
+);
+criterion_main!(benches);

examples/parts/arrays.rs

@@ -1,7 +1,4 @@
-use serde::{
-    Deserialize,
-    Serialize,
-};
+use serde::{Deserialize, Serialize};
 use serde_json::json;
 use toon_format::encode_default;
 

examples/parts/arrays_of_arrays.rs

@@ -1,7 +1,4 @@
-use serde::{
-    Deserialize,
-    Serialize,
-};
+use serde::{Deserialize, Serialize};
 use serde_json::json;
 use toon_format::encode_default;
 

examples/parts/decode_strict.rs

@@ -1,8 +1,5 @@
 use serde_json::Value;
-use toon_format::{
-    decode,
-    DecodeOptions,
-};
+use toon_format::{decode, DecodeOptions};
 
 pub fn decode_strict() {
     // Malformed: header says 2 rows, but only 1 provided

examples/parts/delimiters.rs

@@ -1,9 +1,5 @@
 use serde_json::json;
-use toon_format::{
-    encode,
-    Delimiter,
-    EncodeOptions,
-};
+use toon_format::{encode, Delimiter, EncodeOptions};
 
 pub fn delimiters() {
     let data = json!({

examples/parts/mixed_arrays.rs

@@ -1,7 +1,4 @@
-use serde::{
-    Deserialize,
-    Serialize,
-};
+use serde::{Deserialize, Serialize};
 use serde_json::json;
 use toon_format::encode_default;
 

examples/parts/objects.rs

@@ -1,7 +1,4 @@
-use serde::{
-    Deserialize,
-    Serialize,
-};
+use serde::{Deserialize, Serialize};
 use serde_json::json;
 use toon_format::encode_default;
 

examples/parts/round_trip.rs

@@ -1,15 +1,6 @@
-use serde::{
-    Deserialize,
-    Serialize,
-};
-use serde_json::{
-    json,
-    Value,
-};
-use toon_format::{
-    decode_default,
-    encode_default,
-};
+use serde::{Deserialize, Serialize};
+use serde_json::{json, Value};
+use toon_format::{decode_default, encode_default};
 
 #[derive(Debug, Serialize, Deserialize, PartialEq)]
 struct Product {

examples/parts/structs.rs

@@ -1,11 +1,5 @@
-use serde::{
-    Deserialize,
-    Serialize,
-};
-use toon_format::{
-    decode_default,
-    encode_default,
-};
+use serde::{Deserialize, Serialize};
+use toon_format::{decode_default, encode_default};
 
 #[derive(Debug, Serialize, Deserialize, PartialEq)]
 struct User {

examples/parts/tabular.rs

@@ -1,7 +1,4 @@
-use serde::{
-    Deserialize,
-    Serialize,
-};
+use serde::{Deserialize, Serialize};
 use serde_json::json;
 use toon_format::encode_default;