# Optimistic mining tip (slow block propagation)

**URL:** <https://delvingbitcoin.org/t/optimistic-mining-tip-slow-block-propagation/2139>\
**Category:** Implementation\
**Tags:** bitcoin-core, mining\
**Created:** [December 3, 2025, 10:41am UTC](https://delvingbitcoin.org/t/optimistic-mining-tip-slow-block-propagation/2139 "2025-12-03T10:41:11Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![AntoineP](https://delvingbitcoin.org/user_avatar/delvingbitcoin.org/antoinep/32/483_2.png) [@AntoineP](https://delvingbitcoin.org/u/AntoineP)\
**Post date:** [December 5, 2025, 3:10pm UTC](https://delvingbitcoin.org/t/optimistic-mining-tip-slow-block-propagation/2139/7 "2025-12-05T15:10:52Z")

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> [@optout](#):
>
> Anything else to mentioning?

Optimizing internal operations of mining pools, it’s likely where the bottleneck is now. See [this comment](https://delvingbitcoin.org/t/propagation-delay-and-mining-centralization-modeling-stale-rates/2110/3) on my stale rate modeling thread that shares a blog post which goes into the performance improvement of using Stratumv2 for pools. The fact that some pools appear to be making their own (!!) blocks stale appears to corroborate this (see [here](https://bnoc.xyz/t/antpool-mines-two-blocks-at-height-925051/60?u=antoine) for Antpool mining two blocks at the same height, and [here](https://bnoc.xyz/t/viabtc-mining-pool-mines-multiple-blocks-at-same-height/48?u=antoine) for ViaBTC mining two blocks at the same height).

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