Kraken had so many issues at the beginning. Trading during high-volume hours was next to impossible: orders were not getting filled (sometimes they didn't even

Kraken had so many issues at the beginning. Trading during high-volume hours was next to impossible: orders were not getting filled (sometimes they didn't even reach the order book!), the UI wasn't loading, etc. Then they shut down for a while and rebuilt everything starting from the matching engine. I guess they also reworked their architecture because after that, it was smooth sailing ever since.