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jason
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</head>
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<body>
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<div class="page">
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<div class="hero">
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<p class="kicker">ECHO Memory · Performance Update</p>
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<h1>Full-vault operations: from timing out to sub-second</h1>
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<p class="sub">Releases v1.1.0 and v1.2.0 rebuilt the vault's network layer and entity
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resolution. Long operations that used to exceed the agent tool timeout and drop the
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session now complete in under a second — and shortened entity names resolve instead of
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spawning duplicates.</p>
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<div class="meta">
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<span><span class="pill">v1.1.0</span><span class="pill">v1.2.0</span></span>
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<span><b>Prepared</b> 2026-06-22</span>
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<span><b>Vault</b> 186 notes · 119 entities</span>
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<span><b>Endpoint</b> echoapi.alwisp.com</span>
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</div>
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</div>
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<div class="body">
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<section>
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<p class="lede">Scripts that sweep the whole vault — <code>sweep.py</code>,
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<code>vault_lint.py</code>, recall rebuild — were making hundreds of <em>serial</em>
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requests, each opening a fresh TLS connection, and re-reading every note 2–3 times.
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On the constrained agent sandbox that pushed a single pass past the ~120-second tool
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timeout, so the process was killed mid-run and the session/thread was dropped. The
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fix attacks the cause on three axes; the headline change is reliability:
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<strong>a full-vault pass that used to fail now finishes in well under a second.</strong></p>
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</section>
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<section>
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<h2>At a glance</h2>
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<div class="metrics">
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<div class="metric"><div class="num">4.5×</div><div class="lbl">faster per request<br>(connection reuse)</div></div>
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<div class="metric"><div class="num">~2×</div><div class="lbl">added by concurrency<br>(full-vault scale)</div></div>
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<div class="metric"><div class="num">2–3×</div><div class="lbl">fewer requests<br>(single-pass cache)</div></div>
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<div class="metric"><div class="num good"><1 s</div><div class="lbl">full-vault pass<br>(was: timeout)</div></div>
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</div>
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<p style="margin-top:6px">These factors compound. A full-vault pass pays
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<strong>4.5×</strong> less per request, issues <strong>~2–3×</strong> fewer
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of them, and runs the rest <strong>~2×</strong> in parallel — a modeled
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<strong>~18–27×</strong> reduction in total request-time, before counting the
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higher connection latency of the production sandbox where the old path actually failed.</p>
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</section>
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<section>
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<h2>What changed</h2>
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<div class="h2sub">Three structural fixes, one resolution overhaul</div>
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<div class="grid g2">
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<div class="card"><h4>Connection reuse (keep-alive)</h4><p>One persistent
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connection per thread, reused across every request — instead of a fresh TCP+TLS
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handshake per file. The single biggest win; benefits every operation
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(load, capture, recall) for free.</p></div>
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<div class="card"><h4>Concurrent bulk reads</h4><p>A new <code>read_many()</code>
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fans GETs across a thread pool (8 workers). I/O-bound work, so it parallelizes
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cleanly; the win grows with vault size and network latency.</p></div>
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<div class="card"><h4>Single-pass shared cache</h4><p>Each note is fetched
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<em>once</em> and reused across all passes — eliminating the 2–3× re-reads and
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the per-link-target re-fetch storm in <code>sweep</code>.</p></div>
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<div class="card"><h4>Entity resolution (v1.2.0)</h4><p>Shortened names now resolve
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via aliases + a fuzzy fallback, so a mention like “echo memory” finds the
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existing project instead of silently creating a duplicate note.</p></div>
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</div>
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</section>
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<section>
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<h2>Measured — per request</h2>
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<div class="h2sub">Connection reuse is the dominant win</div>
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<p>Micro-benchmark: 25 real notes, best of 3 runs, against the live endpoint.</p>
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<div class="bars">
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<div class="bar"><div class="name">Fresh connection / GET <em>(old)</em></div>
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<div class="track"><div class="fill old" style="width:100%">30.3 ms</div></div></div>
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<div class="bar"><div class="name">Pooled keep-alive (serial)</div>
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<div class="track"><div class="fill" style="width:21.8%">6.6 ms</div></div></div>
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<div class="bar"><div class="name">Pooled + concurrent <em>(new)</em></div>
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<div class="track"><div class="fill best" style="width:18.8%">5.7 ms</div></div></div>
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</div>
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<table>
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<tr><th>Mode</th><th class="n">ms / request</th><th class="n">vs old</th></tr>
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<tr><td>Fresh connection per GET (old)</td><td class="n">30.3</td><td class="n">1.0×</td></tr>
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<tr><td>Pooled keep-alive, serial</td><td class="n">6.6</td><td class="n delta">4.5×</td></tr>
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<tr><td>Pooled + concurrent (new default)</td><td class="n">5.7</td><td class="n delta">5.3×</td></tr>
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</table>
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</section>
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<section>
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<h2>Measured — full vault (186 notes)</h2>
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<div class="h2sub">Serial vs concurrent, both pooled</div>
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<table>
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<tr><th>Operation</th><th class="n">serial (1 worker)</th><th class="n">concurrent (8)</th><th class="n">speedup</th></tr>
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<tr><td>vault_lint.py</td><td class="n">1.77 s</td><td class="n">0.90 s</td><td class="n delta">2.0×</td></tr>
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<tr><td>sweep.py (plan)</td><td class="n">1.64 s</td><td class="n">0.85 s</td><td class="n delta">1.9×</td></tr>
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<tr><td>sweep.py --apply</td><td class="n">—</td><td class="n">1.07 s</td><td class="n">—</td></tr>
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<tr class="muted-row"><td>single GET · doctor</td><td class="n">—</td><td class="n">0.28 s · 0.21 s</td><td class="n">—</td></tr>
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</table>
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<div class="note warn"><strong>Before the fix:</strong> the same passes exceeded the
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~120-second agent tool ceiling and were terminated mid-run, dropping the session.
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The numbers above are the <em>new</em> floor; the practical change is
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<strong>fails → completes</strong>.</div>
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</section>
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<section>
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<h2>Efficiency — entity resolution (v1.2.0)</h2>
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<div class="h2sub">Fewer duplicates, less wasted work</div>
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<p>Resolution was exact-match only, so a shortened or expanded name returned
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<em>nothing</em> — and the writer would create a parallel note. The active project
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slugged <code>echo</code> was invisible to the mention “echo memory.” Now:</p>
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<table>
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<tr><th>Lookup</th><th>Before</th><th>After</th></tr>
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<tr><td>echo memory · echo plugin · echo-memory</td><td><span class="delta" style="color:var(--bad)">no match</span></td><td class="delta">→ projects/active/echo.md</td></tr>
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<tr><td>non-aliased shortened name</td><td><span style="color:var(--bad);font-weight:700">no match</span></td><td class="delta">ranked candidates</td></tr>
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<tr><td>update under a new name</td><td>second slug, same note</td><td class="delta">canonical slug + alias learned</td></tr>
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</table>
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<p style="margin-top:10px">Aliases are auto-derived from titles, learned from mentions on
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update, and stored in note frontmatter (folded back into the index on sweep) — so the
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graph gets <em>better</em> at resolution over time, while exact-match safety prevents
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wrong auto-merges. The payoff is avoided duplicate entities and the cleanup/merge passes
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they trigger.</p>
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</section>
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</div>
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<div class="foot">
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<p><b>Methodology.</b> Measured on the maintainer's workstation against the live
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<code>echoapi.alwisp.com</code> endpoint (low latency). The production agent sandbox has
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higher per-request connection latency, so the connection-reuse gain — and the reliability
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fix — is larger there than the local figures show. The ~18–27× compound is a model of
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the three measured factors (4.5× reuse × ~2× concurrency × ~2–3× fewer reads),
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not a single end-to-end timing. Stdlib-only; no new dependencies.</p>
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<p><b>Artifacts.</b> echo-memory v1.2.0 — <code>echo-memory-1.2.0.plugin</code>.
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33 automated tests pass; vault-health linter clean of regressions.</p>
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</div>
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</div>
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</html>
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