There are a number of things that can contribute to poor performance. Read the Troubleshooting: game and device performance to diagnose some issues. If you are repeatedly getting the WiFi icon, you can perform a more technical diagnostic “PING” test.
A ping utility is used to test the reachability of a host (like the SA Game server). It measures the round-trip time for data sent from the originating host to a destination device that are then echoed back to the source.
The ping name comes from active sonar terminology, that sends a pulse of sound and listens for the echo, to detect objects under water.
Simply put, a ping calculates the speed or delay of game data transferred between your device and the Sniper Arena servers. The longer the transfer takes (higher number) the slower the game responsiveness (lag).