As @digipl says, there are a few factors that affect the tx rate...
Group size and quorum size will be larger on the real network and thus expected to be slower than my test network. However since the vaults in this test never came anywhere close to breaking a sweat the result of 100 tx/s is extremely conservative (from a vault perspective). The actual tx/s that vaults can handle would be much higher but couldn't be tested because the launcher couldn't handle that much data. To put out a haphazard guess: since cpu load didn't change on the vaults during testing and is measured in 0.25% increments, there's potential for at least a 400-fold improvement in tx rate from the vault side taking the estimate to at least 40K tx/s/group.
Global transaction rate increases as the network size increases (ie number of groups), so there is no upper bound on global transaction rate. This is an amazing property of the safe network and is so different to bitcoin that comparing tx rates between the networks is basically an instant red-flag for trolling (guilty!).
The rate will be affected by other work groups have to do such as storing immutable data, churn etc. However prioritizing certain data may help retain the high overall tx rate (if that's considered a priority in the first place).