Adobe will be forced to make Flash 64-bit for Snow Leopard eventually. When that happens, do you think that Flash issues will be fixed? When do you think it will happen? Thanks.
The overal performance issues with Flash has nothing to do with being 64 bit or not. The root problem is that Adobe has not written the Flash software to be optimized to use Apple’s technology and has never really improved it over the years. Flash sucks on the Macs because Adobe’s software is not efficient - they concentrated their Flash efforts to the Windows platform years ago.
Flash shouldn’t need to be dependent on 64 bit of memory - they are not that dependent on memory. The code needs to be improved. That’s going to take an effort on Adobe’s end - flash can still stink no matter what it’s compiled in.
Temperature and performance are directly correlated, it's extremely difficult to fix one without also fixing the other. Also, 64 bit has nothing to do with crashes (with the exception of Safari's out of process plugin support, and that's just because it turns on unrelated changes in 64 bit mode only).
64 bit flash may help performance some, which in turn will help power usage a bit. It's also certainly possible that the out of process plugin support has some overhead, which could be addressed by a Safari update. Difficult to say without doing more in depth testing using Shark or Instruments.