diff --git a/src/gep/assetStore.js b/src/gep/assetStore.js
index d776fc4..e226b5e 100644
--- a/src/gep/assetStore.js
+++ b/src/gep/assetStore.js
@@ -139,11 +139,26 @@ function getLastEventId() {
   try {
     const p = eventsPath();
     if (!fs.existsSync(p)) return null;
-    const raw = fs.readFileSync(p, 'utf8');
-    const lines = raw.split('\n').map(l => l.trim()).filter(Boolean);
-    if (lines.length === 0) return null;
-    const last = JSON.parse(lines[lines.length - 1]);
-    return last && typeof last.id === 'string' ? last.id : null;
+    const stat = fs.statSync(p);
+    if (stat.size < 64 * 1024) {
+      // Small files: read entire file
+      const raw = fs.readFileSync(p, 'utf8');
+      const lines = raw.split('\n').map(l => l.trim()).filter(Boolean);
+      if (lines.length === 0) return null;
+      const last = JSON.parse(lines[lines.length - 1]);
+      return last && typeof last.id === 'string' ? last.id : null;
+    } else {
+      // Large files: read only last 4KB
+      const fd = fs.openSync(p, 'r');
+      const buf = Buffer.alloc(4096);
+      fs.readSync(fd, buf, 0, 4096, stat.size - 4096);
+      fs.closeSync(fd);
+      const raw = buf.toString('utf8');
+      const lines = raw.split('\n').map(l => l.trim()).filter(Boolean);
+      if (lines.length === 0) return null;
+      const last = JSON.parse(lines[lines.length - 1]);
+      return last && typeof last.id === 'string' ? last.id : null;
+    }
   } catch { return null; }
 }
 
@@ -151,10 +166,27 @@ function readAllEvents() {
   try {
     const p = eventsPath();
     if (!fs.existsSync(p)) return [];
-    const raw = fs.readFileSync(p, 'utf8');
-    return raw.split('\n').map(l => l.trim()).filter(Boolean).map(l => {
-      try { return JSON.parse(l); } catch { return null; }
-    }).filter(Boolean);
+    const stat = fs.statSync(p);
+    const MAX_EVENTS_TO_READ = 10000;
+    const CHUNK_SIZE = 1024 * 1024; // 1MB chunks
+    if (stat.size < CHUNK_SIZE * MAX_EVENTS_TO_READ) {
+      // Small files: read entire file
+      const raw = fs.readFileSync(p, 'utf8');
+      return raw.split('\n').map(l => l.trim()).filter(Boolean).map(l => {
+        try { return JSON.parse(l); } catch { return null; }
+      }).filter(Boolean);
+    } else {
+      // Large files: read only last 10K events
+      const fd = fs.openSync(p, 'r');
+      const chunkSize = Math.min(stat.size, CHUNK_SIZE * MAX_EVENTS_TO_READ);
+      const buf = Buffer.alloc(chunkSize);
+      fs.readSync(fd, buf, 0, chunkSize, stat.size - chunkSize);
+      fs.closeSync(fd);
+      const raw = buf.toString('utf8');
+      return raw.split('\n').map(l => l.trim()).filter(Boolean).map(l => {
+        try { return JSON.parse(l); } catch { return null; }
+      }).filter(Boolean);
+    }
   } catch { return []; }
 }