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Its engine wall clock also runs 200 ms longer than the execution client's own stopwatch.",image:"./thumbnail.png",date:new Date("2026-08-19T00:00:00.000Z"),keywords:["lodestar metrics","lodestar_gossip_execution_payload_verification_time","lodestar_execution_engine_notify_new_payload_result_total","engine api latency ethereum","attestation deadline 4 seconds","besu forkchoiceupdated slow","optimistic sync ethereum","execution client comparison","consensus client observability","prometheus histogram buckets","which execution client lodestar","reth staged sync","lodestar synced but exec-block syncing","lodestar_sync_status","lodestar_gossip_block_elapsed_time_till_processed","slot timing ethereum"]},l=void 0,r={image:s(90286).A,authorsImageUrls:[void 0,void 0]},c=[];function h(e){const t={a:"a",code:"code",p:"p",...(0,a.R)(),...e.components};return(0,o.jsxs)(o.Fragment,{children:[(0,o.jsxs)(t.p,{children:["Lodestar publishes 1,175 metric names and 162 histograms on our fleet, 62% more metric names than any other consensus client we run and twenty-seven times Teku's histogram count. ",(0,o.jsx)(t.a,{href:"/blog/where-the-slot-goes-teku",children:"Part five"})," ended by asking whether the richest instrument answers the question in this series' title better than the sparsest one did."]}),"\n",(0,o.jsx)(t.p,{children:"It does, and by a wider margin than we expected. Lodestar decomposes a block's journey into timers that add up: arrival, the wait on the execution layer, import, head. The pieces sum to the whole within 4 milliseconds. One bucket boundary sits at 4.000 seconds, so the share of blocks not processed by the attestation deadline is a count rather than an interpolation. It is 5.1% of blocks on the best execution client here and 9.0% on the worst, while only 0.11 to 0.16% of blocks arrive after 4 seconds at all."}),"\n",(0,o.jsxs)(t.p,{children:["Then the same instrument turned around and told us something about itself. Five execution clients time their own engine-API handlers, and four of them publish a mean we can subtract. Lodestar's wall clock around ",(0,o.jsx)(t.code,{children:"newPayload"})," runs 181 to 208 milliseconds longer than what the execution client on the other end says it spent. The four other consensus clients that publish a mean sit 6 to 50 milliseconds above their peer. That gap is not a client comparison, it is a measurement about Lodestar, and it took a second stopwatch at the execution client's end to find it."]})]})}function d(e={}){const{wrapper:t}={...(0,a.R)(),...e.components};return t?(0,o.jsx)(t,{...e,children:(0,o.jsx)(h,{...e})}):h(e)}},73739:e=>{e.exports=JSON.parse('{"permalink":"/blog/where-the-slot-goes-lodestar","source":"@site/blog/2026-08-19-where-the-slot-goes-lodestar/index.md","title":"Where the slot goes: Lodestar, and the 200 ms between two stopwatches","description":"Lodestar times the slot end to end in milliseconds. 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