Decreasing load times and optimizing performance: Preparing a Large project in Hype

Hi,
the last post here ist 2 years old but I hope I can get help here anyway.

I have a large hype project with several scenes that I exported separately and distributed on several subdomains. I have severe loading problems and pagespeed insights says (on most of them):

  • Avoid enormous network payloads
  • Serve static assets with an efficient cache policy
  • Minimize critical request depth
  • Minimize main thread work
  • Reduce JavaScript execution time
  • Avoid an excessive DOM size

... I know this sounds really bad and I'm not a programmer, have no clue about JS programming stuff and that is maybe one of the problems.

However, I searched for help in the forum for days and tried the following:

What I tried until now:

  • I converted all pictures to jpeg2000 (cause page speed insights told me to)
  • I unchecked the "automatically optimize" button in the resources tab (there were layout problems...)
  • I unchecked the preload button in the tab

What I tried but didn't work very well:
I read in the forum that most of the problems could be solved by a htaccess file that manages compression and caching. I tried these

and this

and this

I created the file, uploaded it to the folder xyz.hyperressources and renamed it to .htaccess.
The compression code doesn't have any effect on the loading time, also in page speed insights the same problems are displayed.
Uploading the caching code causes the page to turn blank with error 500 or 404.

What I will try in the future but need more information:

  • Using a CDN like Amazon CloudFront.

Can anybody help me?
Have I missed something?
Is there another possibility to decrease the load times?
Have I done something wrong?
And are there any tips for this CDN thing? Do I have to have privacy concerns using this (I live in Germany...)

Thanks guys, really appreciate that you kept reading till the end.