You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
SDKArea: what it touches
ImprovementsKind: in v2.1.311,
ImprovementsSection of the release
What
When Claude Code finishes a turn (one round of you asking and Claude replying), it produces a result record. That record can now include optional figures about streaming, the process of receiving Claude's reply piece by piece:
process_cpu_ms_streaming, the processor time used while streaming
process_wall_ms_streaming, the clock time spent streaming
main_stream_count, main_stream_event_count and main_stream_chunk_count, counts of the streams and their parts in the main conversation
These fields are marked internal. Only certain workers send them, and only when an internal check passes.
Why
These are performance measurements. They do not change how Claude Code behaves for you.
