Update:
Fedora 42 is good. It is hard to explain. But I mean noticeably good. Maybe it is the underlying GCC 15, LLVM 19 and Golang 1.24 compilers optimizations which made everything noticeably faster. Or maybe I am deluded.
Fedora 42 official release date is 2025-04-22 and Fedora 40 EOL date 2025-05-28
For those who are still on Fedora 40 and have not upgraded to Fedora 41, Maybe if Qubes OS project manages to release stable Fedora 42 templates before 40 EOL, it would be justifiable to skip upgrading to Fedora 41 and upgrade directly to Fedora 42.