Sorry for the delay in getting back to you Alicia, this time of year is manic for RL birthdays and things.

Anyway, I don't think 100,000 is a good target for concurrency in terms of SL as a MUVE, and it's one that I would be happy to mark myself as failing on when we reach it in April and we're between 250,000 and 500,000 come the end of the year. But...

Whilst I do trust, more or less, that LL have people beavering away to do this, previous experience suggests that each time they find and smooth away one bottleneck they discover another another one not much further down the line.

I rather strongly suspect that this is actually why we haven't seen more competitors for SL in years gone by. They can look at where SL is and try to stress test to exceed SL's concurrency and you know what? It's hard work!