Since I formatted my computer and installed open office on it - writing in documents are very slow many times. It’s like it freezes or something. I then installed Libre office cuz I remembered that was the one I used before… But still the same issue.
Anyone know why? 
It would be a good idea to identify what operating system and version of Libreoffice you are using. When does it freeze? Is it a particular type of document? etc, all this can help find the issue.
Windows 7, Libre office 4.2
When I have the documents open and I do something else and then go back (click the document) and it will take a while before I can actually write in it. And so forth.
Since I formatted my computer
this gives me the thought that the problem has to do with your “formatting” and recommend to first evaluate the effect of your computer “formatting”.