I'm not sure i fully understand what questions you are asking, I am having to use Google translate to read you post and it is not making a lot of sense.
it seams the main issue you are asking about is the speed of loading the pages.
the page load time does not realy seam to take that long for me
if i visit you domain and request a page that does not exist:
it takes about 3 seconds to bring up the 404 page not found error.
If i visti any other page on your site:
it doesn't take much longer than that, that page took about 5 seconds to load, it has to download all of the images for you page to the browser and retrieve other resources.
perhaps i am completely misreading your post, i'm not sure.