What Should i place in httpd.conf to optimize apache for my server

My server is

Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz
Ram: 4 GB
100mb uplink

Please tell me what kind of code should i place in httpd.conf file to optimize my server also what should i place in mysql file for my server

right now i am using this code in httpd.conf

Timeout 30
KeepAlive On
MaxKeepAliveRequests 200
KeepAliveTimeout 4
MinSpareServers 15
MaxSpareServers 40
StartServers 15
MaxClients 300
MaxRequestsPerChild 1000

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I am experiencing slow site opening with these settings please help.

 

It is very unlikely that these settings have anything at all to do with your site being slow.

Without any more information, the first suspect I would check is slow MySQL queries. If you have a MySQL slow log, look in that using the mysqldumpslow utility. If you have lots of slow queries then it's time to learn how to optimise SQL queries. It's possible that your queries are all waiting for locks. If you see a lot of lock time waiting in your slow log, consider switching to InnoDB.
If you don't have a MySQL slow log then you should put this in your /etc/my.cnf:

[mysqld]
set-variable=long_query_time=2
log-slow-queries=/var/log/mysql/log-slow-queries.log

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One thing you might find in your Apache conf that can slow your site down is reverse DNS lookups. Apache can look up the domain name for each and every client that hits your site so it can put those domains in the logs. Turn this off if it's on.

PHP can also do requests over the internet. If you write something like:

include("http://www.google.com");

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then every page request will need to do a Google request first, which will take a second or two.

Even something like

include("http://www.mysite.com/includes/bootstrap.php");

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can still take several seconds. Even though it's a site that's on the same server as it's running on, it will still need to do a DNS lookup and may end up sending the request out to the internet before it comes back in and hits your server.

Using

include("/var/www/includes/bootstrap.php");

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will be much faster.