Can you look at this top, please ?

[SecondSight]

Hello !

I've managed to reduce the load on my server and have it working fine, but I still have one or two sudden high server loads per day. You can have a look at one here when I had about 480 users online (mp4 file) :
http://www.andrejorge.info/divers/18-03/HIGH_SERVER_LOAD.mp4

One example of a top running earlier the same day with 590 users online :
http://www.andrejorge.info/divers/18-03/590_users.mp4
Another one :
http://www.andrejorge.info/divers/18-03/450_users.mp4

I'm trying to optimize MySQL and HTTPD, and will have a closer look into it tonight, but simply looking at the tops, do you think there may be a server misconfiguration ? Can you advise me ?

Thank you ! :)