Thank for reply,
I checked the margin error and its quite low.
Total Load Time: 6.1250seconds avg.
Site Load Time 4.0484seconds avg.
Profile Overhead: 2.0767seconds avg.
Plugin Load Time: 1.9800seconds avg.
Theme Load Time: 0.0441seconds avg.
Core Load Time: 1.9298seconds avg.
Margin of Error: 0.0944seconds avg.
(6.1250 observed, 6.0306 expected)
Number of PHP ticks: 18,658 calls avg.
Memory Usage: 54.63 MB avg.
MySQL Queries: 121 queries avg.
Moreover I am checking only 2 pages for admin panel (funny cause those are the posts and pages ), because the moderator who are going to add posts and modify pages will look on those most often.
As for the caching I use W3 total cache with Object Cache enabled (isnt it enought? ). As for site its great, but is admin cached fully? I will look into the ones which you suggested.
I have to add that as for now number of pages and posts is really small (around 60 pages and 10 posts), so what will happen when there will be 60 pages and 600 posts, I do not want to end with admin panel not accessible.
I tried uninstalling plugins (which off course disabled the time for plugins, but the core load time was still around 2 secs).
I also tried the option you mentioned (opcode optimizers) and still the same. Moreover I tried changing to default theme (the same results, or even worse :) )
So Im kind of stuck, maybe the PHP ticks should be blamed, or the memory (unfortunately I already tries to maximize that - no luck - my server provider doesnt allow it to be more than 64MB ;/ ) Do you think it can be the problem?
Thanks in advance