fbxLoader multiThread

hi all
It is inconvenient to use the browser when loading fbx files asynchronously.

Repeats stop and play for a short period of time. (About 0.1 second stop)

It seems to me that it is not due to the download of the fbx file, but the computational load due to parsing.

I tried to use multi-thread to solve this, but I got the following error.
=> Cannot use import statement outside a module

It takes about 2 seconds to load about 10 files, but at least 100 files can be loaded at a time because it needs to support the user’s network play environment.
Users may experience discomfort for about 20 seconds.

Is there no way to use mutil-thread?