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After some tests in webmaster I see this - for first time download Googlebot need 1.2-1.6 ms, but all next download is below 0.5 ms. Maybe is problem with page cache?

For homepage - http://www.i-medic.ro, I see 81/100, but this javascript and css problems we have always. Inclusive before December 16.

By the way, this issues can't affect download time for Googlebot..

We have dedicated server. Load time in test is good - 3s, problem is only with time spent downloading a page. Because this time has increased (from 500 ms to 1500 ms), decreased number of crawled pages per day.

Screenshot below

http://awesomescreenshot.com/0884797vc0

If you need more details, please say.

Number of crawled pages going down.

http://awesomescreenshot.com/0884797vc0

No changes for CDN and serve images

We have some JavaScript and CSS issues (average score 80/100), but this problems we have always.

Starting on December 16 time spent downloading a page increased sharply.

http://awesomescreenshot.com/0f2474ek48

We tried to find the problem, but without success. We did not changed the server and we did not changed anything on the site.

http://www.webpagetest.org/result/150115_ZP_D4G/ - here you can see performance test results.