Will the i3 (1.8 GHz, dual-core w/HT, im not sure which specific model, but maybe 3rd gen) be okay for daily web browsing, office documents and presentations, and 2d autocad? I should be doing some multitasking, like web browsing while drawing 2D plans in autocad or office work while web browsing. It has 4GB RAM. 500 GB HDD SATA. definitely Intel HD 4000. It's an Acer E series laptop. thanks in advance.