my server down random every day 4-5 time cause get high load very quick..

I have install csf and with some config server now stable.. load around 5.

BUT the big isuse is : the real user very hard to access website specially from IE browser you can test at xaluan.com

the flowing is config using in csf:

SYNFLOOD = "1"
SYNFLOOD_RATE = "100/s"
SYNFLOOD_BURST = "10"

CONNLIMIT = "80;30"
PORTFLOOD = "80;tcp;70;5"
CT_LIMIT = "29"

# other config may same as default

i playing around with this config for a week but still not work around..

If increase the rate SYNFLOOD_RATE = "140/s" or more.. the website response very fast.. be side have bad effect of server load increase so fast normal 20 and may be up to few hundred in peck time ..

my need is response time fast but load still low.. please help

thanks

ps: server runing nginx frontend, apache, mysql, php ,, the home page has around 70 elements which will cached in browser in fist time access..