multi threaded feed fetch

[veganomy]

Checklist

• [x] I made sure that there are no existing issues - open or closed - which I could contribute my information to.
• [x] I have read the FAQ and my problem isn't listed.
• [x] I'm aware that this is a request for NewPipe itself and that requests for adding a new service need to be made at NewPipeExtractor.
• [x] I have taken the time to fill in all the required details. I understand that the feature request will be dismissed otherwise.
• [x] This issue contains only one feature request.
• [x] I have read and understood the contribution guidelines.

Feature description

When the subscriptions cross beyond 30, the fetching starts to feel slow. Currently they're being fetched single threadedly. If fetched in multiple threads (for example 4), it could finish within the seconds.

Why do you want this feature?

To speed up the feed fetching

Additional information

No response

[veganomy]

Will this be triaged anytime soon ?