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The AIP defines p as "the priority of the last transaction included in the previous PGA round". The page said "that round", which makes the boost depend on the round it is applied at the end of.
The AIP specifies a single block time of 250ms, with K rounds per block. No 100ms block time appears in the proposal. The round length varies with K, not the block time.
The AIP does not state that the priority queue is re-keyed when the base fee changes between blocks. The diagram asserted a specific reordering that the proposal does not describe, so it is removed pending SME review.
The AIP attributes protection from sandwich attacks and frontrunning to the private mempool, which publishes ordering only after sequencing, not to the Timeboost ordering policy. That protection predates Timeboost and survives PGA, as the page already states further down.
Adds four details the AIP specifies that the page omitted: - K stays adjustable in [1,10] for two years after activation, giving round lengths from 250ms down to 25ms. - The Timeboost auctioneer stops accepting bids and the express lane endpoint shuts down on the activation day. - The Sequencer stops enforcing the 200ms non-express-lane delay, which only applied while an express lane controller held the round. - Arbitrum One splits priority fee proceeds 97/3 between the DAO treasury and the Developer Guild, distributed by a separate vote every six months.
Removed commented-out section for 'Use Timeboost' from sidebars.js.
vbridge-hash
requested changes
Sep 4, 2026
6 tasks
Co-authored-by: Pete <petevielhaber@gmail.com>
Co-authored-by: Pete <petevielhaber@gmail.com>
Updated the status of PGA to indicate its availability for activation across all Arbitrum chains.
jsouto18
requested changes
Sep 7, 2026
jsouto18
approved these changes
Sep 14, 2026
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Description
PGA explainer.
Document type