How do I fix Mac OS X startup slow?

After the Apple system has been in use for some time, it will find that the system is getting slower. We can try to clean up the stacks of files, folders, etc. on the desktop, because the more files you have stacked on your desktop, the slower the Mac OS x will start. In addition to deleting desktop files, you can create a new folder, put all the desktop files inside, anyway, the less desktop things the better.

Also note that the desktop files, programs, applications, and so on, to minimize icon icons, and avoid thumbnail previews, such as video, PDF and so on.

Second, you can also close the file thumbnail preview, in the desktop blank area, directly click the right mouse button-> view display options, directly in the Display icon preview before the check out.