Cold Fusion 10 Standard - Throttled Flash Remoting or Not?

We have server running CF10 Standard which basically a one trick pony - doing one only thing - handling flash and AIR romote object requests from browsers and devices.

I'd expect this to go smoothly but we're seeing a number of errors popping up when the server is under load ( we're talking pretty small loads  - maybe 100 concurrent users across browsers / devices )

The errors are often duplicate http session or recently Error deserializing client message and they don't seem related to the code / device  just distributed randomly.

What I'd like to know is simply:

Is CF10 Standard  throttled for Flash Remoting in some way ?

Was this introduced in CF10  ( and was not in CF9, 8 ) ?

Aside from upgrading what can be done in CF Admin to optimise Flash Remoting in CF10 Standard ?

Thank you.