Hi all, So recently (within the past week or so), my iMac's performance has decreased drastically. Programs take forever to load and buffer, and when I have applications such as Mail and Firefox open simultaneously, everything slows down further. A week ago I could be running 10 different programs at once and not experience a significant slowdown, but now I struggle with simply one. I've restarted and hardbooted multiple times. I've watched the Activity Monitor, and the percentage of my computer's CPU stays between 90-95%. I've tried clearing caches (I think). I'm not fluent in Mac yet (convert from a Dell 4 months or so ago), so I apologize in advance for my ignorance, haha. The only remembered big change was that I loaded 800 or so RAW format photos into my computer, which I sifted down into about 300. But out of my TB, only about 125GB has been used. What else should I do to further diagnose this extreme lag?