The most important aspects for a WI-FI connection are speed and distance.
Depending on your setup you can have only good speed without the need of caring about the distance e.g: your PC is very close to the router.
However the distance and the objects between your PC and the router will often dictate the quality of your WI-FI connection. e.g: how many walls are in between and other large, metallic objects.
Sometimes in can be only that the software that you are using needs updating or even the firmware on your router if the one that it was shipped with is old.
So here are a few easy steps you can follow that should help you improve the WI-FI connection:
1. If Possible place your router as close to the area(s) where you want to have a good WI-FI coverage
2. Don’t place large metal objects between your computer and the router
3. Place your router on a wall, not on the floor far from cordless phones and microwaves because the waves emitted by those can interfere with radio reception
4. Improve the WI-FI signal by installing a repeater or a Powerline adapter. A WI-FI repeater can be used to boost the signal strength in areas where the reception is poor