That's so weird, my R5 has superb wi-fi performance.
All I use it for is Spotify (both offline and downloaded).
It's the OG version, but I doubt that has any bearing on wifi
I think you should both contact Hiby.
I have noticed some slowdown when starting up, and starting Spotify.
I think this may be due to Spotify updates becoming more demanding(?).
I'm looking forward to hi-res Spotify, if it ever happens, but I am concerned about whether the R5 will be able to cope with whatever changes need to be made to the app.
It's still fine once the app is up and running (except for some slowness updating artwork while scrolling etc), but I do feel that initial boot has either become slower over time, or I have become more impatient!
Generally though I still love my R5 in all other respects.
If/when Hiby release a successor to the R5 I hope it will add:
Slightly faster processor.
Physical hold button.
Volume wheel instead of buttons.
Same size, same sound quality, same everything else would be fine by me (but I wouldn't kick even better SQ out of bed!).