Imaging Resource has it's performance numbers up for the G1 and they are better than I had expected.
"The Panasonic G1's timing performance is slightly slower than average for consumer SLRs, but still faster than typical all-in-one digicams."
"All in all, decent shutter lag numbers, certainly competitive to consumer-level SLRs, when it comes to the in-hand experience."
"Single-shot cycle times are an area where the Panasonic G1 also lags somewhat behind many competing consumer SLR models. Given that it can shoot at a very comfortable 3+ frames/second in continuous mode, we had hoped that the roughly 0.85 second cycle time in single-shot mode would have been something that would improve in final production firmware, however this does not seem to be the case. That said, one shot every 0.85 second isn't bad, it's just that it's more of a digicam level of performance rather than one befitting a camera intended to compete with SLRs."