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As "thetechfirm" already wrote, IO Graphs can show you the bandwidth used with a granularity of 1ms.
Statistics -> I/O Graph, select Bits as your Y-axis and fill out display filter if you so desire to focus on specific traffic. Then at the bottom of the graph window, in the "Interval" drop-down you select 1ms.
You can also export the data by clicking Save As and import it into Excel or similar for graphing.
It is also possible to use Riverbeds excellent SteelCentral Packet Analyzer software which comes in different flavors. That can also (very easily) show you bandwidth usage with 1ms granularity. It excels working with very large capture files, where Wireshark unfortunately typically gives up.
