This is a video I took of what my Macbook Air is doing. Excuse the rambling. Just to add: I did turn off all extensions and Safari still lags I also did clear the cache and cookies and the random lags still occur. I haven't done anything different besides upgrade from Mavericks to Yosemite. https://www.youtube.com/watch?v=IOuHU1ysPIE&spfreload=10 Any input or advice how to correct these issues would greatly be helpful.