diff --git a/esbuild.config.js b/esbuild.config.js
index a842a2c6b9..bc50dc265e 100644
--- a/esbuild.config.js
+++ b/esbuild.config.js
@@ -112,6 +112,11 @@ esbuild
     },
     define: {
       'process.env.CLI_VERSION': JSON.stringify(pkg.version),
+      // react-reconciler ≥0.33 (ink 7) gates its dev build behind NODE_ENV
+      // and calls performance.measure() on every render, leaking
+      // PerformanceMeasure objects into the global measureEntryBuffer.
+      // Setting production here tree-shakes the entire dev build (~15k lines).
+      'process.env.NODE_ENV': JSON.stringify('production'),
       // Make global available for compatibility
       global: 'globalThis',
       // Redirect free __dirname/__filename references to the shim so that