Discrepancy of Elapsed Time To Become Head

### Describe the bug

based on this report https://probelab.io/ethereum/block_arrival/2024-29/
and https://ethresear.ch/t/gossipsub-message-propagation-latency/19982
less than 92% of block imported in the first 4s

however lodestar showed 99.6% blocks imported in the first 4s

### Expected behavior

investigate why there are discrepancy:
- is this due to different hardware
- or is this due to I/O lag
need to work with Probe Lab on this

### Steps to reproduce

_No response_

### Additional context

_No response_

### Operating system

Linux

### Lodestar version or commit hash

v1.21.0

Start by comparing the Probe Lab report and ethresear.ch discussion linked in the issue with Lodestar's reported metrics for v1.21.0. Investigate whether hardware or I/O lag explains the discrepancy, coordinating with Probe Lab; done means the cause is identified and documented.

Written by the indexing model from the issue text.