arma: I think maybe one of the reasons why this is only a problem for high-bandwidth nodes is that a high bw node already has really high cpu usage. Fluxe3 has no problem doing lots more crypto than it usually does, it won't have a big queue of onionskins it still needs to decrypt etc, so it can close connections quickly. Relays with high cpu load need to keep them open longer, introducing more overhead, etc.
fluxe3 was at 15% cpu earlier this morning. Now it is 4%. It used to be between 1 and 3%.