Have you tried plugging an ethernet wire from your computer to router? The wireless aspect often sux, but the wired connection would be top speed. What wireless standard does your laptop's WiFi card support? If it's just "802.11g" then a modern "802.11ac" router won't help much. You can replace the wireless card in your laptop with an "802.11ac" WiFi card for more wireless speed. But wired is better (ie, Gigabit).
http://www.cnet.com/products/synology-rt1900ac