I tried many things to fix my problem but since Chromium v. 49 my browser is broken.
Chromium OSX 48.0.2564.116 works perfectly, with its default settings or my settings + extensions.
I use Mac OS X 10.9.5, I don't have this problem with Safari or Opera, but I want to use Chromium (better settings and speed in my opinion).
The problem is that -sometimes- some tabs don't load, the page is blank and it loads indefinitely. Whatever site I choose it happens randomly. Sometimes it works, sometimes it does not. I have to close the tab(s) who don't load and open another one(s) and then it loads the page(s).
It happens even with the default settings, I deleted everything related to Chromium on my Mac and started a fresh install, it doesn't fix the problem.
I use a simple test, I open a website, like Amazon, and click 10 times on same link to open 10 identical tabs.
As you can see on this screenshot : i.imgur.com / wUTZC3s.png , 3 tabs didn't load, the 7 other worked properly. (delete the space besides / to see the link)
That problem also broke my extensions. When I click on their icon address bar, sometimes I can't see their menus, I must go to the extensions settings, deactivate and activate the extension and it works again.
But I don't think it's an extension related problem, it happens with the default settings and zero extension installed.
Thanks for your help.