It helped! You were right. PermGen size was definitely not enough and allocating more memory for this is the solution.
Here's the log from Java VisualVM without -XX:MaxPermSize=256M:
Here's the log from Java VisualVM with -XX:MaxPermSize=256M:
Thank you very much, mr. painter73! I am happy now for a long time.
A am also allocating more PermGen memory to my server as well because i have nearly the same picture as for client.
May be Chicken-Bones should add it to FAQ section in questions about "Omg, my supermodded minecraft freezes", i don't know.
Also i found a notification about changing PermGen size on spigot forum: http://www.spigotmc.org/wiki/changing-permgen-size/