Try pining your router and you will find that there is something called ping or latency also known as LAG! In other words every setup has lag. Even you RAM had LAG! Yes that is right did you ever look at what those numbers after the ram speed actually mean? Well they are called the "Latency Timings" or in other words LAG TIME!

Timing Definition Abbreviations What it does
2 CAS Latency CL Delay between activation of row and reading of row
3 RAS to CAS (or Row to Column Delay) tRCD Activates row
2 Row Precharge Delay(or RAS Precharge Delay) tRP/tRCP Deactivates row
6Row Active Delay (or RAS Active Delay, or time to ready) tRA/tRD/tRAS Number of clock cycles between activation and deactivation of row
1 Command Rate CMD Rate Delay between chip select and command