seleena Rhiadra

I am using my Dell i5 inspirion laptop and SL has been acting strange. Movement is moments after I try to move, and at times, I keep walking into the blue beyond. I always use a laptop with SL, never had this issue with them. Any ideas? I did the ping test, it runs at 18 ms, 1ms jitter and 0 packet loss. I have set the preferences to the lowest I have ever used on SL, meaning all the way down, lowered hz, raised cache, nothing has helped.