Hi Bart,
weird, I have the opposite. The pages load slow on Android devices. On the PC, which is connected via LAN to the OH3 server, the page loading times are faster but still up to 5 seconds.
I am currently investigating if the rrd4j default settings (everything is persistent) is responsible for that.
In my setup that means around ~500 items.
There was a thread with a similar issue:
BR
Marco