Chrome can build up a "cache" of files over time that can lead to lag. Make sure you clear your cache.
If that doesn't help, try rebooting the computer. Your computer itself will also slow down over time the longer it stays on, and sometimes small bugs can happen which can be easily resolved by restarting.
Try rebooting your modem/router - many issues (lag, robotic-sounding calls, breaking up, visual glitches etc.) can all be caused by inconsistent connection. You can try running a speed test, but be aware that speedtest.net will not show you if your connection is consistent.
If none of this helps and the issue persists, please contact us so we can assist you!