[CentOS] tools one could to use to troubleshoot for Apache

Have a question , Suppose i had a client tell me that  he can access the web
page but it takes long time to view  the pages   the website is a static
website ( suppose this website does not server dynamic data  or does not
connect to a database )... what would one check other than :

the server load  ( cat /proc/loadaverage )  ,

 the Apache logs  ,

 the number of client connection ( netstat -tupln |grep :80 |wc -l )

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how would i know if it a client side  issue or a server side issue ........

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Regards
Agnello D'souza
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