On January 14, according to $Sui's official Twitter, the $Sui mainnet is currently experiencing network congestion, and the $Sui core team is actively seeking solutions.
As a result, decentralized applications such as Slush or SuiScan may be temporarily unavailable, and transaction processing may slow down or be temporarily halted. $Sui stated it will share updates promptly once more information becomes available.[DeepTide TechFlow]