100 transactions per second per user

And this is only limited because of the client, the vaults can handle vastly more if needed.

Worth reading this explanation of SafeCoin tx rate which estimates about 40K tx / s / group: https://safenetforum.org/t/profiling-vault-performance/10331/47

Still early days for this, especially given the work currently underway to improve the client side (which is the current bottleneck for tx rate).