调试引擎源代码出现浏览器卡死现象

antd pro前端项目，在config.ts中配置headScripts，将原cdn lowcode-engine的地址改为http://localhost:5555/js/engine-core.js。

项目都能正常起启，但进入本地项目前端浏览器页面卡死，已偿试多次，只要将地址切换cdn就能够流畅的操作。

请给予方向，从哪里入手解决。

Start with the antd pro project's config.ts and reproduce the issue using the localhost:5555/js/engine-core.js headScripts URL, then compare it with the CDN URL that works. Use the browser's available diagnostics to determine why the local engine causes the page to freeze. Done means the local source loads without locking the browser and the frontend remains usable.

Written by the indexing model from the issue text.