We've been investigating causes for slowness or delays in loading the Dashboard and specifically
Query Log
We've identified poor-performing queries in our Analytics API as a contributor and have temporarily disabled the auto-refresh feature of the Overview and Insights pages to reduce requests and improve performance for standard page views. We plan to reintroduce an opt-in auto-refresh setting, along with performance improvements to these pages, in the coming weeks — in the meantime you can manually reload the page to see updated data.
We appreciate your patience.