Think I've pinned it down @George
I noticed it when commenting some lines and every few characters the page refreshes, so if that comment was a sentence 'This is a comment so you remember what you did last weekend' the page refreshed half a dozen times during writing it. And on top every action within the page en tales a refresh. Thus if you work quite fast there are an awful amount of refreshes occurring. This seems to be the issue and this is when my fans ramp up considerably.
