Whitepaper: "At the moment, the block generating rate is manually set at 15 seconds. With low enough latency in inter-nodes connection in the future, most blocks will be generated by every 1 second. With the bandwidth at 100Mbit/t and external cryptographic computing hardware, the Antshares Blockchain is capable of handling thousands, if no tens of thousands, of transactions per second.

Meanwhile, Antshares adopts a pluggable modular design. Users may employ their own consensus mechanism, ECC/Hasing Algorithm, P2P network protocol, etc. Antshares is easy to be reconstructed into a consortium/private blockchain with Antshares being viewed as the consortium’s/company’s voting power. Proof-of-concept trails can be performed on the public chain of Antshares by businesses while a quick shift and reconstruction to consortium/private chain is within the reach. Also, businesses may run Antshares-deprived consortium/private chain and shift it to the Antshares public chain without the hassle of rebuilding peripheral systems."

...it looks like this is essentially a side chain solution to congestion and private chains would also use Antshares. I have also head of "sharding" and "concurrency" as part of the solution but I'm not particularly knowledgeable on those topics.