I tried this in my Mac Pro 2012, system speed is improved

[RAJESHWAR]

Hi friends,
I was searching online to increase my Mac Pro speed with out upgrading hard disk to ssd and increasing RAM. Disabling all animation in Mac OS will help opening your apps fast. When you close an application and reopen it, it will start from where it left disable it, then the app will open fast. These tips worked for me. Now my machine is working fine,

*******I found this code online********

If you don't want to copy-paste each of the commands shown in the top answer, just select this text, copy-paste it to the terminal and press enter (it will execute all commands at once without having to scroll)

defaults write -g NSAutomaticWindowAnimationsEnabled -bool false
defaults write -g NSScrollAnimationEnabled -bool false
defaults write -g NSWindowResizeTime -float 0.001
defaults write -g QLPanelAnimationDuration -float 0
defaults write -g NSScrollViewRubberbanding -bool false
defaults write -g NSDocumentRevisionsWindowTransformAnimation -bool false
defaults write -g NSToolbarFullScreenAnimationDuration -float 0
defaults write -g NSBrowserColumnAnimationSpeedMultiplier -float 0
defaults write com.apple.dock autohide-time-modifier -float 0
defaults write com.apple.dock autohide-delay -float 0
defaults write com.apple.dock expose-animation-duration -float 0
defaults write com.apple.dock springboard-show-duration -float 0
defaults write com.apple.dock springboard-hide-duration -float 0
defaults write com.apple.dock springboard-page-duration -float 0
defaults write com.apple.finder DisableAllAnimations -bool true
defaults write com.apple.Mail DisableSendAnimations -bool true
defaults write com.apple.Mail DisableReplyAnimations -bool true
To undo the changes, paste this into the terminal:

defaults delete -g NSAutomaticWindowAnimationsEnabled
defaults delete -g NSScrollAnimationEnabled
defaults delete -g NSWindowResizeTime
defaults delete -g QLPanelAnimationDuration
defaults delete -g NSScrollViewRubberbanding
defaults delete -g NSDocumentRevisionsWindowTransformAnimation
defaults delete -g NSToolbarFullScreenAnimationDuration
defaults delete -g NSBrowserColumnAnimationSpeedMultiplier
defaults delete com.apple.dock autohide-time-modifier
defaults delete com.apple.dock autohide-delay
defaults delete com.apple.dock expose-animation-duration
defaults delete com.apple.dock springboard-show-duration
defaults delete com.apple.dock springboard-hide-duration
defaults delete com.apple.dock springboard-page-duration
defaults delete com.apple.finder DisableAllAnimations
defaults delete com.apple.Mail DisableSendAnimations
defaults delete com.apple.Mail DisableReplyAnimations
Mac OS X also has dialog boxes, such as the 'Save As'-box (CMD+SHIFT+S) or the 'Print'-box (CMD+P). You can tweak the speed at which all of these boxes appear by using these commands:

Instant:

defaults write NSGlobalDomain NSWindowResizeTime .001
Fast:

defaults write NSGlobalDomain NSWindowResizeTime .1
Default (0.2 seconds):

defaults delete NSGlobalDomain NSWindowResizeTime
1 = 1 second. To see the difference you have to re-launch an app such as Terminal and summon a dialog box by pressing CMD+S ('Save') for example. You can find more command-line tweaks in defaults-write.com

 

[Flint Ironstag]

I haven't had to search for little tweaks like that since the early OS X days. Hopefully you did this for the joy of learning, and not because you have to. If any Mac Pro is that slow, there's an underlying problem(s)!