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server waiting time 2.5 seconds

hey forum,

im developing webshop, , know! need fast , react instantly when customers navigate or adding cart.

my problem: have 2 seconds of server waiting time, on every page load, if page cahed , click on homepage..
see image: http://www.ssdbutikken.dk/waitingtime.png
http://www.ajytzler.dk/pics/loadtimenet.jpg

technical information:

joomla 2.5.6
virtumart 2.0.14
yootheme - nano2
theme settings: http://www.ssdbutikken.dk/themesettings.png
debug info: http://www.ssdbutikken.dk/debug.png

to reduce loading time/waiting time have done following:

joomla cache progressive setting.
using joomla debug features identify modules delay process.
reduced number of querys run pr. page 550 75..
used approx 200$ on 3rd party caching software.

cache settings: www.ssdbutikken.dk/cache.png

what have on site slow down or problem:

just of modules/functions have:

4 different languages
rsjoomla newsletter + rsformspro
piwik open source tracking
zopim tracking , chat
facebook like
ajax livesearch
smart content tabs (sidebar , frontpage)
product filter search ( narrow down relevant product)
header tag: www.ssdbutikken.dk/header.png

a total failure, approx 6s add product cart..

add cart: http://www.ssdbutikken.dk/addtocart.png

my .htaccess file:
www.ssdbutikken.dk/htt.txt

i have contacted server host, , tell me bottleneck in code/template...

note: vm2 extremely fast, ive seen examples of shops 350k products , several thousands of categories.. reacts faster 28 product store...

ive been through hell , this, , im praying maybe have clue how fix this!

if needed glady supply admin account/login details inspect....

i want thank in advance!!! appreciated!

i invest more money in hardware...your site doesn't "sound" bad you've described , showed.

are on shared hosting? provider?

get vps , install php opcode cache, apache modules deflating content, optimize mysql , apache. scale hardware , profile site. check out content delivery network. host db on it's own server.

sacrifice cpu , memory speed , spend more money on hardware.

don't shared hosting. i've moved "heavy" sites onto optimized vps , watched become lightning fast, stuff suggest scales more traffic comes too!

maybe check out cloud options scale on demand? invest money in better hosting/network...not on "caching" extension.