Jetpack had been making my site slow all the time zzz...
I love Jetpack's functionally but when I heard Rich saying something about P3 plugin and tried it, I found out that it is a resource hog.
And even after you uninstalled it, the loading time is still long.
So, if anyone has uninstalled jetpack, you need to remove the css and js from jetpack..
I tried the method described in the above link and my page load decreased by 3 seconds.