Do any of your other drains drain slowly also? could be your septic. if it is just your toilet draining slowly sounds like you may have to lift the toilet to see what is plugging it. I had to once found a play hamburger bun. was plugging the toilet.

 I'm a real plumber :) If the snake ran into a block it's a greese build up and you neen help!
If not click my name and go to Plumber Help and explain better! :)