perf: optimize defaults - chunk size 20 for precision, 100 parallel requests

- Changed chunk size from 75 to 20 for better subtitle alignment
- Increased parallel requests from 50 to 100 for faster processing
- Updated README with chunk size recommendation for precision
- Updated license to GPL-3.0

README.md

@@ -20,8 +20,8 @@ Translating subtitles is tedious and expensive:
 ## ✨ Features
 
 - **Drag & Drop** - Just drop your SRT file and go
-- **50 Parallel Requests** - Blazing fast translation
-- **Smart Chunking** - Processes 75 subtitle blocks per request for optimal speed/accuracy balance
+- **100 Parallel Requests** - Blazing fast translation
+- **Smart Chunking** - Processes 20 subtitle blocks per request for optimal precision
 - **Marker-Based Alignment** - Each subtitle block stays aligned with its timestamp
 - **Custom Instructions** - Add context-specific translation rules (e.g., "Use informal 'sen' instead of formal 'siz'")
 - **Custom Model Support** - Use any model available on OpenRouter
@@ -43,10 +43,15 @@ Translating subtitles is tedious and expensive:
 | Setting | Default | Description |
 |---------|---------|-------------|
 | **Model** | `google/gemini-3-flash-preview` | AI model for translation |
-| **Chunk Size** | 75 | Number of subtitle blocks per API request |
-| **Parallel Requests** | 50 | Maximum concurrent API calls |
+| **Chunk Size** | 20 | Number of subtitle blocks per API request |
+| **Parallel Requests** | 100 | Maximum concurrent API calls |
 
-### Recommended Model
+### Recommended Settings
+
+**Chunk Size: 20** is recommended for better precision. Smaller chunks mean:
+- Less text drift between subtitle blocks
+- More accurate timing alignment
+- Slightly more API calls, but with 100 parallel requests it's still fast
 
 For the best **performance/cost** balance, we recommend:
 

index.html

@@ -54,11 +54,11 @@
                 </label>
                 <label>
                     <span>Chunk Size (SRT blocks)</span>
-                    <input type="number" id="chunkSize" class="input-field" value="75" min="10" max="200">
+                    <input type="number" id="chunkSize" class="input-field" value="20" min="10" max="200">
                 </label>
                 <label>
                     <span>Parallel Requests</span>
-                    <input type="number" id="parallelRequests" class="input-field" value="50" min="1" max="100">
+                    <input type="number" id="parallelRequests" class="input-field" value="100" min="1" max="100">
                 </label>
             </div>
             <div class="instruction-section">

src/app.js

@@ -3,7 +3,7 @@
 // ============================================
 
 const DEFAULT_MODEL = 'google/gemini-3-flash-preview';
-const DEFAULT_PARALLEL = 50;
+const DEFAULT_PARALLEL = 100;
 const MAX_RETRIES = 3;
 const RETRY_DELAY_MS = 1000;  // 1 second
 const REQUEST_TIMEOUT_MS = 30000;  // 30 seconds