Since high latency can be an indicator of network congestion, checking for excessive bandwidth usage is a logical first step. This can be due to numerous devices or applications consuming large amounts of data, which would delay the traffic flow. It is the most likely cause of the problem compared to the other options. Updating network drivers, while a valid step, usually addresses compatibility or functionality issues and is less likely to resolve latency. Checking ISP speeds is a broad action and should be done after confirming there are no issues within the internal network. Swapping cables may address physical connectivity issues, but is not the most direct step to resolving high latency issues.