And no, the slower miners don't see any negative impact, because we accept shares, and pay them for shares for (CurrentBlock) and (CurrentBlock - 1). If a block is solved every 600 seconds, it would take them 1200 seconds to have their new shares for a getwork become stale.
That is not what is stated in the OP.
- Anti-fraud protection. We only accept shares from the current block, in the current round.
This pool is in beta, and many things have changed since the original post. This was one of the changes.
Before your post just a few minutes ago, this change was never mentioned. If this would have been stated a long time ago, this discussion could have been avoided.
Such as change should make stale shares nearly impossible for any miner at any speed and completely resolves the issue of slow miners and stale shares.
There are potentially problems that this could bring up, but they should be relatively minor unless specifically gamed in a similar fashion to the original (still existing in this pool) switching form of cheating. Although, I wouldn't put it past people to do such.
Edit: Even today, FairUser stated that the pool only accepts work from the current block.
[...] they risk working too long on a getwork and the network's block count increases by one making their work stale. [...]