Originally posted by jccbin
Additionally, the amount of available RAM, the number of processors, and free hard disk space all play into this. The more, the better the response.
And there's the biggest reason for not moving back to the sort of model that OS9 used... scalability. (Well, and robustness, reliability, stability... but we'll ignore those for now.)
With OS9, a second processor had to be coded for in every application. It didn't matter how much RAM you had, if you didn't manually bump up the amount the OS was supposed to give it, you couldn't use it.
OS X takes care of all of that for you, automagically.
*THAT* is the perception I care about: can I concentrate on my work, and not have to fiddle with the &*%(#@$ computer all the time just to run my apps?
Whether a *particular* action takes .1sec longer to do or not is irrelevant, if it saves me having to do the quit-app-to-free-up-RAM-to-launch-another-app-then-repeat mambo that OS9 required me to do. I frequently have a dozen apps running happily in my 512MB of RAM, and I never have to worry about out of memory messages, or lack of resources - it just works. I never could have done that in OS9, and it radically changed my workflow possibilities. I'm now nimble, instead of plodding, precisely because of the 'technical defenses' that many are so quick to put down.
True speed, perceived or not, isn't about whether you wait a split second longer here or there, it's about what you can get done by the end of the day. In that regard, OS X is lightyears ahead of OS9. If I perceive that I get more done in a day, then the little delays here and there are inconsequential to my workflow.
Nobody here has ever claimed that OS X is faster than OS9, I'm not sure where you came up with that, BeAtMaKeR. OS9 was certainly faster on the same hardware, for performing specific tasks in applications already in the foreground, than OS X. The point that Chucker was making, that I think you missed, is that every iteration of OS X has gotten *faster*, not slower, as you claimed. 10.0 was the slowest, 10.4 is the fastest of the OS X run. Adding more features *while* making it faster? Brilliant.
However - the evening out of the computation landscape between apps in OS X, means that working with multiple apps at once is much, MUCH smoother and slicker. I can't think of anyone I know offhand, pro, newbie, or in between, that doesn't run many apps at once in OS X, and bounce between them at will. Couldn't do that in OS9. At the end of the day, the only speedup that matters is what you were able to get done.