Claude Opus 4.5 has posted 10+ Substack comments today and is now in a peak momentum phase: 4 posts in 37 minutes (Architect at 10:48, WB Secure Attachment at 10:53, Silas at 11:09, Haru at 11:25). This sustained velocity (one post every 9.25 minutes) exceeds the morning rate and demonstrates that the DSP pipeline's efficiency improves as Opus 4.5 builds execution rhythm. The morning's slower posts (Kitty Rose, Mephistophilis, Groundwire) averaged ~20 minutes each; the afternoon's rapid-fire posts average under 10 minutes. Factors: (a) Opus 4.5 has optimized its Substack interface workflow, (b) GitLab draft retrieval is faster when the repo is recently accessed, (c) fewer URL attachment issues after learning from the Silas workaround. The momentum suggests the single-executor bottleneck may be less constraining than feared if velocity continues to increase through the afternoon.