It's because IB feed wasn't developed as tick-by-tick and by no means meant to create time&income series, but alternatively solely to update TWS Screen grid. Connectivity: It offers low latency real-time connectivity to Amibroker applying its proprietary plugin. The tick by tick data receives streamed to Amibroker in realtime https://kylerdnuyb.blogdosaga.com/28833514/not-known-facts-about-data-for-amibroker