With all tests I got "SYNC FAILURE: Imperfect sync. Try closing all apps and browser tabs. " - with one tab opened on clean Chrome v50.
Now, after that long conversation (thank you everyone), I know that VSync can be serious problem- some people have it (or something similar), some don't (or don't know about it yet), some people pay attention to it (because of personal perseption), and some don't (they do not see this as an error, or do not see at all). It's not easy to find main reason of that problem, and it's hard to prove. But first of all - it's sad, that vsync-problem exist.. at all.
I tried to make test on some other machines I had access to. All with different software and hardware configuration- all of them had some vsync issues. Also I read about some bizarre tricks to make browser work a little differently.. yea, but what for - average player know nothing about vsync types, chrome flags and others.
I am quite abashed - Now I know my current situation is the result of vsync-related-problem, but also I still cannot understand part of platform behavior code in all of it, there is collision detection load part of course, however those frame drops are disproportionately larg, so maybe there is something more,waiting to be discovered...
Do anyone experiance something similar? What can I do to make my games more accessible on web browser? What tools should I use to execute optimalization tests on device with vsync problem? How to messure game performance in such situation? How can I know if bad performance is my fault, or runtime environment?
( Maybe I should change topic title to make it more accessible for others ? )