A high CPU/Memory utilization may result in a slow internet speed. When a computer's resource utilization goes beyond 70%, it has a considerable impact on the internet speed. Try reducing the number of tabs running on your web browser. Additionally, you can follow these steps to check and kill applications that consume too much computer memory.
- Go to your Spotlight search and type "Activity Monitor."
- Select CPU to see the topmost app and the CPU utilization percentage.
- Select the app/process with the highest resource consumption, then click this button to kill the process. At the bottom of the page, if the idle CPU is below 30%, this may cause a slow connection.