With SlingPlayer on a PC or Mac, a slow Internet connection at home can affect picture quality when viewing remotely. With SlingPlayer for Windows Phone connections, the type and quality of your phone's data connection or capacity will have an even greater impact.
Connecting to a 3G network (such as EV-DO or HSDPA) allows for better quality streaming versus an older generation data network (such as GPRS or EDGE). If your mobile device supports Wi-Fi, consider using it in locations where your cellular connection may not be very fast. In all cases, the stronger your network signal strength, the better results you'll see.
SlingPlayer for Windows Phone also allows you to directly configure quality settings.
If you're experiencing pauses or hiccups in video playback; noticing audio/video syncing issues; pixelated, blocky, or blurry video; and if these issues seem to appear more often with high-action content or after extended periods of playback, you might try reducing the Video Quality setting from High to Standard. Just remember that video playback with the Standard setting may not be as sharp or clear as the High setting.
Again, if your phone's data connection or capacity is poor, making any of these changes might not have a positive impact.