Frame-rate stability

Contract

Field	Bound contract
Trigger	A rendering path needs stable multi-metric performance against fixed targets.
Authority	Reversible local: writes only named local artifacts; rollback is version control. No remote mutation. State and follow the rollback path before mutating.
Side effect	Multi-metric frame-rate stabilization: local writes to the rendering path and its configuration.
Done	Every fixed target holds for two consecutive comparable runs.
Stop	Stalled; blocked; capped. Bound: fixed hardware, build, scene, budget, and target values. The rendering-path settings are the mutation; they freeze only across the two consecutive comparable runs.

Inputs

• Fixed hardware, build, scene, and budget (required): parameters that affect rendering performance and stay frozen for the whole run, named before any mutation.
• Target values (required): fixed numeric thresholds for each metric: frame-time (ms or FPS), CPU (ms or %), GPU (ms or %), and memory (MB or GB). Every target must be a concrete number, not a directional goal like "lower" or "faster".
• Rendering-path settings under test (required): the quality levels, resolution scaling, draw-call batching, shader complexity, and asset-streaming values the stabilization step tunes. They are the mutation. They freeze only across the two consecutive comparable runs.

Procedure

1. Bind the hardware, build, scene, budget, target values, and starting rendering-path settings. Freeze the hardware, build, scene, budget, and targets for the whole run; only the settings are open to tuning. Done when: every bound element is named and frozen, and each metric has a concrete numeric target.
2. Stabilize the configuration against the fixed targets. Adjust rendering-path settings (quality levels, resolution scaling, draw-call batching, shader complexity, asset streaming) to meet every target. Collect frame-time, CPU, GPU, and memory evidence per change. Done when: every target is addressed with evidence showing the current configuration meets or misses it.
3. Define the sampling window and run-comparability rules. The sampling window is the fixed duration or frame count over which metrics are measured (for example, 10 seconds or 600 frames at a fixed scene position). Run-comparability requires: same hardware, same build, same scene, same settings, same sampling window, same measurement tool. Declare the window and rules before running. Done when: the sampling window and comparability rules are declared in writing.
4. Execute two consecutive comparable runs. Both runs use the frozen inputs, the declared sampling window, and the same measurement tool. Record per-target results for each run. A target holds only if both runs meet its threshold. If a target fails in either run, revisit step 2. Done when: both runs complete with per-target results recorded, or a target fails and is revisited.
5. Stop at success (all targets hold for two consecutive comparable runs), any non-success terminal, or the bound. Done when: a terminal class is reached and named.
6. Persist the run record to .outline/loops/frame-rate-stability/<run_id>/ when durable. Emit receipt.json before return. Done when: the receipt is written with per-target evidence from both runs, the sampling window, and the terminal class.

Failure and recovery

• No safe gain: no stabilization preserves the targets without a visual or behavioral regression. Terminal stalled; report what was attempted and why the gain was unsafe.
• Blocked: the hardware, build, or scene cannot be exercised. Terminal blocked; report the blocking condition.
• Budget exhausted: the declared budget is spent before every target holds for two consecutive runs. Terminal capped; report which targets held and which remain. Budget exhaustion is never success unless it is the predeclared success predicate.
• Incomparable runs: if the second run uses different inputs, sampling window, or measurement tool than the first, the runs are not comparable. Re-run with identical conditions; do not compare incomparable runs.
• Partial result: emit the evidence and target results obtained; never present a single-run pass as two-consecutive-run proof.

Output

A terminal classification (success, capped, stalled, blocked, exhausted, or pending) plus the per-target frame-time, CPU, GPU, and memory evidence from both consecutive runs, the sampling window, comparability rules, and the run receipt.