@masoud Both have direct connections to their respective servers because #GrapheneOS comes without Play Services. Both apps prompted me for exemptions to "Battery optimizations" which I granted.
On the sending side I made sure (by looking at the double ticks ✅ ) that the messages were delivered instantly.
@daniel
I wonder if this is related to the bandwidth/power optimizations that XMPP clients/servers support (e.g. CSI) or just general app bloat.
@masoud