Scenario
Block propagation and regional arrival lag.
Endpoint A subscribes with Yellowstone/Geyser Subscribe blocks over gRPC; endpoint B subscribes with Solana blockSubscribe over WebSocket. Datasets from all regions are merged by number + hash to detect the leader and followers for each block.
Of the possible 31 regions, 3 were selected for data collection: N. Virginia, Frankfurt, and Singapore.
Each location probe breaks its processing loop if / when the endpoint response is too-many-requests, a.k.a. HTTP code 429 etc. Also, codes 401 and 403.
At the time of the report generation: 6 of 6 datasets were available from 3 selected regions x 2 endpoints.
Findings
Summary by Dataset
Summary by Block
Includes only "complete" blocks (blocks seen by every probe). The p95 of the values in the column "p95" is: 571.3 ms.
Details
Per block, leading endpoint-region vs. every other arrival for the same block hash, incl. blocks not seen by every probe. Regional "wall clocks" are treated as globally synchronized.