Asp.net UI Performance tuning

1.using gizp compress page ,gif file can't be compressed.
2.put script at the bottom,and put css at the top.
3.make the css and js external.
4.load-on-demand.(If a UI block need to show by control.Set visibable=false. and enableviewstate=true,override the saveviewstate method.)
5.remove the duplicate js file.
6.set expire header to static files.
7.make fewer http requests
8.minimize the control id.