Dropping in here to say that as a programmer I'm always super impressed with how easy it is to go back many years in WhatsApp via find and quickly scroll arou

Dropping in here to say that as a programmer I'm always super impressed with how easy it is to go back many years in WhatsApp via find and quickly scroll around it. Always makes me wonder if I'm doing something wrong in my client-server app which struggles at the tens of thousands scale and if I'd be better off re-architecting to replicate all data to the client and just using the insanely powerful CPUs that are available there. I'm sure if I did it in my high scale, highly mutable (esp access control), high user count application replicating all that state reliably would also become a nightmare, whereas whatsapp has a pretty clear replication model built in.