I see over 130 requests to retrieve .js files, and I think it is a reason why the magento2 site is so slow. How can I optimize it? I've already set merge and bundle js files in admin, but it's not helping. I've enabled product -s mode, ran di:compile etc. Still the same. Thanks a lot.
Magento by default is known to be robust and use a lot of resources.
On the topic of js bundling this article might help:
Another performance improvement might be using Redis for Page Caching or Session Caching
Information about configuring Redis can be found in the official docs