AutoCAD 2015 Crashing & Bogged Down

I have been working with the free trial for a few days now, and every time upon closing a file, the program crashes. Has anyone experienced this? And if so, will the bug be fixed by the time the subscription update comes out?

Also, I have been working with version 2008 for the last 7 years (I know, I know...get with the times, right?), so I'm trying to get up to speed with what new features there are. Again, after working with 2015 for a few days, it seems as though the program has so many "upgrades" that it is getting bogged down, and I am not able to draft as quickly. What settings can I change so that the program can keep up with my fingers? I have already turned off the hatch preview and command preview, and that has helped greatly, but I'm sure that there are more things I can turn off.

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