Cursor shipped a performance overhaul to Bugbot, its automated pull-request review agent, that cut run times by more than 3x, reduced cost per review by 22%, and raised bug recall by 10%. Ninety percent of runs now finish in under three minutes, Cursor reported on June 10.
The gains come from harness improvements and progress training Composer 2.5, the model now powering Bugbot. Cursor has previously attributed large capability jumps to scaffolding changes rather than model swaps alone. This release is the concrete version of that thesis: a review agent that got faster, cheaper, and more accurate without a headline model release.
Sub-three-minute reviews shift the PR loop from a waiting state to an ambient one. Teams using Bugbot should re-benchmark their review workflows under Cursor 3.7, where a new /review command also lets developers run Bugbot locally before pushing, deduplicating work when the same diff later opens a PR.
Source: Cursor (cursor.com/blog), published June 10, 2026.
