What is the theroretical number for txns per second on Internet Computer right now

One thing I don’t understand though is how come other chains can achieve more than 1k tps despite having higher replication factor and non permissioned nodes?

Which blockchain are you referring to and do they count read-requests as transactions?
I’m specifically trying to avoid this word, since it’s a bit contentious and different people understand different things when they talk about transactions.

The IC can currently (and again, this will improve over time) support around 900 updates/s and more than 36k queries/s per subnet.

So with the current 32 application subnetworks that’s >28k updates/s + 1.2M queries/s.