diff --git a/scripts/verify-web-performance.mjs b/scripts/verify-web-performance.mjs
index 6a917089..a1a20f1f 100644
--- a/scripts/verify-web-performance.mjs
+++ b/scripts/verify-web-performance.mjs
@@ -52,8 +52,9 @@ const allowedLargeChunkPattern = /^(?:vendor-(?:code-highlight|beautiful-mermaid
 // while retaining the initial preload budget and the checks below.
 const boundedDeferredChunks = [
   { pattern: /^vendor~mathlive-loader-.*\.js$/, maxBytes: 850 * 1024 },
-  // Poster editing adds localized controls; the current catalog is ~530 KiB.
-  { pattern: /^i18n-ja-.*\.js$/, maxBytes: 535 * 1024 },
+  // PicGo, pane resizing, and agent diagnostics bring the deferred catalog to
+  // ~539 KiB. Keep a bounded allowance without changing the preload budget.
+  { pattern: /^i18n-ja-.*\.js$/, maxBytes: 540 * 1024 },
 ];
 const allowedLargeChunk = ({ name, size }) =>
   allowedLargeChunkPattern.test(name) ||