Let the hive mind of Engadget get that for you.
"We need a digital camera that can be switched on and fire off that first shot fast. It's not a commonly tracked statistic on any review site, and nobody seems to have this information for every camera. We were hoping other readers could inform us as to what small digital cameras can fire off their first pics in under a second (ideally under half a second). It needs to be small, but mostly, just really quick in operation. Thanks!"
re @Unverified and @MikeTechno's comments about plasma burn-in -- My informal research by way of anecdotal evidence from numerous Panasonic plasma owners, including people I trust and know personally, is that they have not seen permanent burn-in after over a year of use, which includes a mix of 4:3, 16:9, and anamorphic content, all in native aspect ratios and not-zommed (ie., black bars on sides or top and bottom).
Temporary image retention, which can be seen for a very short time (like 30 seconds), happens when some phosphor is exposed to bright material for a long time (e.g., a 2-hour documentary about the arctic in 4:3, then switching to a 16:9 program). Again, my research says that a *good* plasma, such as Panasonics, don't show permanent burn-in.
No plasma manufacturer recognizes burn-in as a "defect", so it's not under warranty. That said, it appears that good plasmas, specifically Panasonic's are resistant to this, and will not show burn-in under "normal" use for several years.
I'm hoping that my TCP65V10 serves me well for at least 5 years, and hopefully longer.