How to speed up applications and Mac OS X start?

hello there, I find my applications start too slow on my Macbook pro Core Duo despite a T7400 Intel processor, 2,16 Ghz .Is Mac OS X for Intel Core Duo really optimized and his applications too? How can I speed up the performance of applications? I'm newbie. I 'd like to have advice, reports and suggestions. Thanks

Application and OS start times are not uniform. Due to heavy use of caching, start times are initially long, but get shorter as time goes on. For example, if you install OS X or a system update that changes the system, the next restart may be very long or may involve a double restart. The next time you restart will be faster, and subsequent startups will be faster still. This is because OS X will progressively build up a startup cache of the items that start up, so they don't have to be loaded from nothing each time. OS X startup times should get shorter until you modify the system again due to an update or installing a new kernel extension.
Applications are similar. Photoshop, for example, takes a long time to start the first time after a system restart. If you exit Photoshop and then start it again, the second time starts up faster. Again, OS X is caching the application data in RAM, but that gets thrown out if you restart. If you restart your computer, Photoshop startup time is back to the longer first-time duration.
My Mac laptop is much older than yours, but it starts up in 35 seconds and applications can start in a few seconds if I've already started them once during the current session. I, and many other Mac users, avoid restarting the machine unnecessarily. Because OS X is based on Unix server software, it is designed for long times between restarts.
I will typically restart or shut down my Mac every week or two. This gives you two advantages we have been talking about: You never wait through the startup time because you are only waking it from sleep, and it means the caches for the current session can stay in use and not get thrown out on restart, so application startup times stay short.
Try using your Mac by simply sleeping it when you don't want it on, instead of shutting it down, and see if that makes any difference. If it does not, there is a possibility that you don't have enough RAM for the types of applications you use.

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