On 14 September 2018 a preliminary stress-test have been conducted on BitShares testnet, simulating a 20 time higher load than currently on mainnet.
Testnet infrastructure is minimalistic compared to mainnet, so in “real world” it should even be more performant.
A more detailed post by @full-steem-ahead : https://steemit.com/bitshares/@full-steem-ahead/bitshares-throughput-testnet-9-13-2018-test-2-0-180817
-Otherego