The startup time cost too long

[fi3ework]

Describe the bug

When triggering the first hover hint, there would be seconds of loading time before data is shown. Maybe this is caused by the large JSON.

[JennieJi]

Hi, do you have idea why the extension does not work in my VSCode insider? I am working on a .tsx file with antd v4

[fi3ework]

@JennieJi Issue not related, tracks in #52