Sadly, you can't truly control crashes or slow speeds with only buying a new laptop, even less so with a consumer laptop like the Dell you list (seems dicontinued by Dell, so you might get a better price at outlet stores).
If you just want to buy a new laptop to run AutoCAD better, regardless of make/model, ensure it has 16Gig RAM, SSD harddrive in the 256Gig size/range if you can afford it (not a slow 5400rpm drive), Intel i5 or i7 processor clocked at the 3Ghz or faster speed (not a 1.8Ghz with an ocasional turbo-boost to 3Ghz), and you do NOT use wireless to connect to a server to open AutoCAD files through.
Your chosen laptop is "ok": I don't know what you use now but new is sometimes just good enough.
Good luck.