Yes, the latency is too large. When I want really instant messages I've to switch to WhatsApp because Hangouts on my phone takes a minute or two to receive mes

Yes, the latency is too large. When I want really instant messages I've to switch to WhatsApp because Hangouts on my phone takes a minute or two to receive messages (tried all configuration tricks in the book). Just an example where latency with messaging apps is already too high.