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Problem: Model loading takes 2-3 minutes on first load with no user feedback, causing confusion about whether the system is frozen or working. Root Cause: GPU initialization (reserveWorstCaseGraph) takes ~164 seconds on Tesla K80 GPUs due to CUDA kernel compilation (PTX JIT for compute 3.7). This is by design - it validates GPU compatibility before committing to full load. Solution: 1. Add comprehensive timing instrumentation to identify bottlenecks 2. Add user-facing progress messages explaining the delay Changes: - cmd/cmd.go: Update spinner with informative message for users - llama/llama.go: Add timing logs for CGO model loading - runner/llamarunner/runner.go: Add detailed timing for llama runner - runner/ollamarunner/runner.go: Add timing + stderr messages for new engine - server/sched.go: Add timing for scheduler load operation User Experience: Before: Silent wait with blinking cursor for 2-3 minutes After: Rotating spinner with message "loading model (may take 1-3 min on first load)" Performance Metrics Captured: - GGUF file reading: ~0.4s - GPU kernel compilation: ~164s (bottleneck identified) - Model weight loading: ~0.002s - Total end-to-end: ~165s 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>