Kibana's Discover UI, a core feature of Elastic, enables users to search, filter, and inspect time series data, but it can encounter issues such as long load times, timeouts, and errors due to factors like uncompressed response sizes, mapping explosions, and browser limitations. This troubleshooting guide addresses common problems, such as page errors on load, missing data views, mapping explosions, field conflicts, slow Elasticsearch queries, and rendering issues influenced by mapping explosions. It offers a structured approach to resolving these issues, including checking browser network tabs, using HAR logs, and adjusting settings in Kibana and Elasticsearch. The guide emphasizes the importance of maintaining good data hygiene to prevent performance issues and highlights that the release of new features is at Elastic's discretion.