Hi everyone, I own a 2012 rMBP(8gb ram, 256gb SSD). Recently, whenever I open up multiple PDF files to read/annotate or highlight I notice my computer starts to become incredibly sluggish and when I check activity monitor the memory that preview has taken up in the background to go up to 30gb when the file size of the pdf is just around 150mb. I've tried deleting the files in the libraries as stated by some threads but nothing seems to be doing the trick. Additionally when I've been using Safari youtube tends to be extremely slow for me most of the time as well. Scrolling starts to inconsistent and whenever I click a video to enlarge it, it hangs for several seconds before jumping into fullscreen mode. Clearing cache, or history doesn't help either. This issues don't seem to be there when I switch over to chrome though. Is there another PDF reader out there that is recommended? Is the Safari issue a bug?