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New mempool TX is always detected a few ms ahead of new block #1516

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@sergey-chernikov

Description

We're running the latest elementsd on prod liquid chain, on Linux, using ZeroMQ notification channels to detect ZCs and new blocks, and always see the same picture:

[11/27/25 08:49:11.240] hashtx: c67a4a64fb33e68b83358a2c91748ce05d2cb0a0cb3c15ba7998d7a8841a4a89
[11/27/25 08:49:11.255] hashblock: de904b5995121e12148dbc0bc82f10925056fdd2aaf5ed0366a267e08ecc2c71
[11/27/25 09:43:11.522] hashtx: b2bac69b345f241ec38e887d08803fff564144f9ad81ad76cca66d3dc775bed3
[11/27/25 09:43:11.546] hashblock: 723b1b5a9b9f850553a8af228af16d8fd228c301a0d62bd3192a9cf5b5d23c55

while the sender sees the TX in mempool for a few dozens of seconds before that.
Is there a way to improve the ZC detection speed? Is elements using async method to detect ZCs in the chain, or just polling for new blocks?

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