System slows dramatically down during GoTo Meetings

From our experience, it's not the driver.  It's a combination of CPU and video (GPU).  All our laptops have 2 core / 4 thread i5 or i7 (atleast 6th gen or higher) with built-in intel video and they suffer when doing desktop sharing.  The laptops with i7 quad core and dicrete videos do not have any issues screen sharing.    

Hi Andrew,
It is entirely possible that your graphics card there cannot account for both GoToMeeting's screen capture methods and the external monitor attached to your Surface Pro.  I would test further without the monitor, as well as checking with the manufacturer's website for any available video drivers you can update.

Recently when using GoToMeeting to share my screen with someone in a different location, my computer became VERY slow. It was like the CPU was being HEAVILY loaded but the task manager didn't indicate that. As soon as I finished the GoToMeeting session, my computer's performance became normal again. The problem has happened 3 times recently, and that interfered with my ability to do my job using GoToMeeting, to the extent that my manager is saying consider alternative options. I need to find some kind of solution. 

My computer is a Microsoft Surface Pro 5. One factor in the problem might be that I am sharing an external monitor, but that is my preference and that shouldn't cause a problem.

Please can you help?

Try changing your display settings to a lower DPI while in your next GoToMeeting session before launching and broadcasting.