Specification: GUI Performance Investigation and Fix

Overview

This track focuses on identifying and resolving severe frametime performance issues in the Manual Slop GUI. Current observations indicate massive frametime bloat even on idle startup, with performance significantly regressing (target 60 FPS / <16.6ms) since commit 8aa70e287fbf93e669276f9757965d5a56e89b10.

Functional Requirements

Deep Profiling:
- Use the high-resolution component timing (implemented in previous tracks) to pinpoint the exact main loop component causing bloat.
- Verify if the issue is in DPG rendering, theme binding, telemetry gathering, or thread synchronization.
Regression Analysis:
- Examine changes since commit 8aa70e287fbf93e669276f9757965d5a56e89b10 to identify potentially expensive operations introduced to the main loop.
Optimization:
- Refactor or throttle any identified bottlenecks.
- Ensure that UI initialization or data aggregation does not block the main thread unnecessarily.

Non-Functional Requirements

Target Performance: Consistent 60 FPS (<16.6ms per frame) during idle operation.
Stability: Zero frames exceeding 33ms (spike threshold) during normal idle use.

Acceptance Criteria

Manual Slop GUI launches and maintains a stable <16.6ms frametime on idle.
Performance Diagnostics panel confirms the absence of >16.6ms spikes on idle.
The root cause of the regression is identified and verified through empirical testing.

Out of Scope

Optimizing AI response times (latency of the provider API).
GPU-side optimizations (shaders/VRAM management).

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