When I tried Carnaval , I got my local copies that I could navigate , the split seconds later the Recordings on Tidal . he speed maybe a localized thing especially with current bandwidth usage of various lock-downs.
I am in South Africa and we don’t have Qobuz yet so I can’t comment on speed specifically.
Could I also suggest an alternative way of getting to the work you want
The Composition view is quite good, rather than using search which as you are discovering is a bit of a blunt instrument.
Open up type Schumann in the Filter Funnel along side Composer.
Now in the filter funnel next top composition type Car and you are straight to Carnval , click the Hyperlink
And you see all the recordings in your and Qobuz (Tidal) Library. Admittedly it still loads all the recordings but in my case this took less than a second for 21 in my library and 423 in Tidal
There are many ways of getting to where you want to get in Roon , some better than others.
I found that I had to rethink my navigation methods initially to I was used to
Composer> Genre > Artist > Album
I now go
Composition View > Composer > Composition
In the case of say Mozart , Type Mozart, Symp and you get all Symphonies then click to get all Recordings of a specific symphony.
If you are open to suggestions there are many ways that can be suggested to ease your learning curve , as you have seen above Tony, Klauss and many others have had to find ways around . In the end there is nothing out there better than Roon so it proves worth the effort. For example read the KB on Tags and Bookmarks , these are good ways of saving real favourites (in my case Beethoven Piano Sonatas) for easy access
I don’t deny highlighting shortcomings (by suggesting Feature Requests) is the way of getting improvement but I may be “rude” moaning before you have mastered the basics will not endear you to the devs or the community in general .
We are here to help, many users have 5 years or of experience , I have 3 plus many years before that in digital audio. Draw on our experience by all means but constructively.
Roon is not perfect but once you have mastered the quirks , as with any software, you will find it a good experience. Keep asking questions and advice.
No Offence Meant
Mike