Time spent downloading a page increased

[GPainter]

Did you try https://developers.google.com/speed/pagespeed/insights/ It can give you some great ideas of things that can help improve the speed.

[adabe]

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

[adabe]

No changes for CDN and serve images

[Martijn_Scheijbeler]

And how about the number of pages that have been crawled, is that going up or down at the same rate? Just trying to get some sense on what is changing, although I still have no idea what is going on.

[adabe]

Number of crawled pages going down.

http://awesomescreenshot.com/0884797vc0

[adabe]

If you need more details, please say.

[GPainter]

Are you on a shared server etc.? did you try a speed test with your hosting see if it's slowing you down ?

[adabe]

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

[GPainter]

Taking a look at your site from the testing tool above I'm seeing 78/100 don't forget the "consider fixing" section which is showing some images not compresses however this doesn't answer your question of what changed I'm afraid only what may help.

[adabe]

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..

[adabe]

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?