On January 30, we announced the availability of Regional Twilio Segment in the EU, which gives you Connections, Protocols, and Personas with data ingestion, processing, storage, and audience creation done on infrastructure hosted in the EU. Before the announcement, we had to make sure that Regional Twilio Segment in the EU would hold up under the usage levels we expected, and that meant doing not just functional testing, but also load testing. In this post, I'll talk about the load testing tool we developed, named Taz, and how it not only succeeded in giving us the confidence we needed in our EU infrastructure, but also found other unexpected uses.