[VERIFIED SCENARIO GUIDE] Vector: VRAM-ENVELOPE-GUARD
Cutting Self-Hosted Agent TTFT by 62% with SGLang RadixAttention & Prefix Reuse
DIRECT ANSWER: Ordering static CLAUDE.md instructions and MCP schemas before dynamic user diffs enables SGLang RadixAttention and vLLM APC to hit 78%+ KV-cache reuse and 3.1x higher multi-turn throughput.
Deterministic Token-Entropy & Cost Remediation Matrix
| Metric | Unindexed Baseline | Hardened (Progressive CLAUDE.md + Router) |
|---|---|---|
| Trigger Symptom | High Time-To-First-Token (TTFT >1.4s) when re-evaluating shared 16k-token system prompts & repo trees | Eliminated (-58% to -64% Discovery Waste) |
| Context Tokens / Turn | 29,800 tokens/turn | 11,320 tokens/turn |
| 5-Engineer Net Monthly Savings | Uncapped Overage Exposure | +$460.00/mo Saved ($5,520.00/yr) |
1-Tap Verdict & TCO Simulator
Select your primary engineering priority:
Team Size:
✓ ACTIVE VERDICT: SGLang RadixAttention / vLLM Automatic Prefix Caching + Deterministic Prompt Ordering (Saves ~$312/mo for 5 Devs with valkey-cluster.prod.conf + Root CLAUDE.md)
Ordering static CLAUDE.md instructions and MCP schemas before dynamic user diffs enables SGLang RadixAttention and vLLM APC to hit 78%+ KV-cache reuse and 3.1x higher multi-turn throughput.
Specimen #1 Unmasked Preview (`valkey-cluster.prod.conf` + `CLAUDE.md`) & Locked 9-File Production Deliverables ▾✓ P99 Load-Tested + Production Docker/Helm Audited • 30-Day Instant Refund Guarantee
# Specimen 01 Preview (SGLang RadixAttention / vLLM Automatic Prefix Caching + Deterministic Prompt Ordering • vllm-project/vllm • 5 Devs): + [valkey-cluster.prod.conf] healthcheck: 5s | restart: unless-stopped | mem_limit: 2g (Production HA Spec) + [Verdict TCO] vllm-project/vllm | route_65_35_cache: true | cap: $188/mo (Saves ~$312/mo)
valkey-cluster.prod.conf (HA Stack)
helm-values.prod.yaml + terraform.tf
prometheus-alerts.yml (SLO Gate)
promptfooconfig.yaml (50-Probe OWASP)
1-Tap Engineering Poll (Optional)
What is your main goal while comparing SGLang RadixAttention / vLLM Automatic Prefix Caching + Deterministic Prompt Ordering and its alternatives today?
More Engineering Scenario Guides
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