I'm using ubuntu apache and my site is created from php, jquery and necessary html & css.
Already I have done lot of things for improve performance. All the js calls after css and first fold no js & css blocking and minimizing css js and sprite images everything is already done.
Now my need is I have to reduce the server initial response time. and
Also sprite image is taking 1 sec to load for just 90kb file.
Can anyone help me to fix these issues.
Thank you in advance.
Here are some great tips about improving site speed
http://developer.yahoo.com/performance/rules.html
in your case, you need to flush the buffer early, here's a detailed explanations: http://developer.yahoo.com/performance/rules.html#flush and of course profile your code and see if you can improve anything there.
you could also make use of Yslow http://developer.yahoo.com/yslow/
for sprite to load faster, see if you can compress more then you already probably did, try to remove something if you can to make it smaller, use a cdn for it.