There is that decade old document adobe has on their knowledgebase that will tell you the basics such as load up your machine with ram, and quit all othere applications.
I am not going to repeat that but try and give teh not so common tricks people forget about
work in rgb, and convert your file to cmyk only at teh very end.
edit >> preferences >> cache levels 8 for faster screen redraws, 1 for faster processinf(eg: filters)
edit >> preferences >> memory usage: try 90% so you leae 10% for OS
edit >> preferences >> displays & cursors>> enable pixel doubling.
Use compression wisely: Eps with jpeg compression at max quality will make smaller files and faster saves with almost no loss in quality. PDF is another good format for the same reasons. PSD is great for when you need layers and get the non-lossy RLE compression for free.