diff --git a/commands/edge_node.ts b/commands/edge_node.ts
index 9150b52..f258122 100644
--- a/commands/edge_node.ts
+++ b/commands/edge_node.ts
@@ -15,8 +15,8 @@ class LeaseLost extends Error {}
 
 /**
  * An edge worker (REBUILD.md, part 2): leases a range from the coordinator,
- * streams its chunks, indexes them, posts a batch every --batch-chunks
- * chunks (each moves the range's resume point), and finishes the range.
+ * streams its chunks, indexes them, posts a batch every --batch-articles
+ * articles (each moves the range's resume point), and finishes the range.
  * Needs COORDINATOR_URL and NODE_TOKEN only. On SIGTERM it gives its range
  * back after the current chunk; the next worker resumes from the last batch.
  */
@@ -25,8 +25,8 @@ export default class EdgeNode extends BaseCommand {
   static description = 'Indexes ranges for the coordinator'
   static options: CommandOptions = { startApp: true, staysAlive: true }
 
-  @flags.number({ description: 'Chunks per posted batch (500k articles: ~4% of releases get a second chunk; LOG.md 2026-10-09)', default: 10 })
-  declare batchChunks: number
+  @flags.number({ description: 'Articles per posted batch (500k: ~4% of releases get a second chunk; LOG.md 2026-10-09)', default: 500_000 })
+  declare batchArticles: number
 
   @flags.number({ description: 'Stop after this many ranges (default: keep going)' })
   declare ranges?: number
@@ -85,7 +85,7 @@ export default class EdgeNode extends BaseCommand {
     let stopped: () => void
     const done = new Promise<void>((resolve) => (stopped = resolve))
     const start = (slot: number) => {
-      const args = [process.argv[1], 'edge:node', `--batch-chunks=${this.batchChunks}`, ...(this.ranges ? [`--ranges=${this.ranges}`] : [])]
+      const args = [process.argv[1], 'edge:node', `--batch-articles=${this.batchArticles}`, ...(this.ranges ? [`--ranges=${this.ranges}`] : [])]
       const child = spawn(process.execPath, [...process.execArgv, ...args], { env: { ...process.env, EDGE_CHILD: String(slot) }, stdio: 'inherit' })
       children.add(child)
       child.on('exit', (code) => {
@@ -113,7 +113,7 @@ export default class EdgeNode extends BaseCommand {
     const started = Date.now()
     const indexer = new RangeIndexer({ group: range.group, start: range.start, end: range.end, resumeAt: range.next, rules })
     const totals = { headers: 0, releases: 0, candidates: 0, bytes: 0, postMs: 0 }
-    let chunks = 0
+    let batchFrom = range.next
     let reachedEnd = false
     // Posts go in order, but the worker indexes on meanwhile (a post took 1–16 s; LOG.md 2026-10-09).
     let posting: Promise<void> = Promise.resolve()
@@ -136,10 +136,12 @@ export default class EdgeNode extends BaseCommand {
     const handle = async (chunk: { to: number; text: Promise<Buffer> }) => {
       if (postError) throw postError
       indexer.addText((await chunk.text).toString('utf8'), chunk.to + 1)
-      chunks++
       reachedEnd = chunk.to >= range.end
       if (reachedEnd) indexer.finish()
-      if (reachedEnd || chunks % this.batchChunks === 0) post(indexer.take())
+      if (reachedEnd || chunk.to + 1 - batchFrom >= this.batchArticles) {
+        post(indexer.take())
+        batchFrom = chunk.to + 1
+      }
     }
     try {
       // Inflating runs on a thread-pool thread: the next chunk inflates while this one is indexed.
diff --git a/config/coordinator.ts b/config/coordinator.ts
index 2492fe8..1030252 100644
--- a/config/coordinator.ts
+++ b/config/coordinator.ts
@@ -5,8 +5,13 @@ import app from '@adonisjs/core/services/app'
 export default {
   /** Articles per range. */
   rangeArticles: env.get('RANGE_ARTICLES', 2_000_000),
-  /** Articles per XOVER chunk (spool files, stream frames). */
-  chunkArticles: env.get('CHUNK_ARTICLES', 50_000),
+  /**
+   * Articles per XOVER chunk (spool files, stream frames). Eweka takes
+   * ~1.5–2 s per command whatever its size: one connection read 9–15k
+   * lines/s in chunks of 25k, ~20k in 50k, ~30k in 100k and 200k (LOG.md
+   * 2026-10-09).
+   */
+  chunkArticles: env.get('CHUNK_ARTICLES', 100_000),
   /** A leased range without a heartbeat for this long goes back to the queue. */
   leaseTtlSeconds: env.get('LEASE_TTL_SECONDS', 15 * 60),
   /** NNTP connections the coordinator fetches headers with. */