Adobe Acrobat reader always consumes more memory when it starts. The reason behind is, it loads all the plugins, even the plugins that you do not use. This trick is to remove all the plugins from the plugins directory to elsewhere. Hence, whenever you open Acrobat reader it directly opens the files without loading any plugins and the speed is just like Notepad.
Go to the installation folder of acrobat reader - ie (C:\program files\adobe\acrobat\reader\.. whatever)
Move all the files and folders from the "plugins" directory to the "Optional" directory. (I repeat.. CUT and paste the files NOT copy & paste).
To easily Cut and Paste, simply select all the folders then Press CTRL + X
Also make sure that acrobat reader is not open else it will lock the files and not allow you to move the files.
Now your acrobat reader will load very fast and almost as good as notepad.