I've been getting periodic Goto Meeting lags/connection issues which have been quite bothersome in discussions. My Goto is running on my home computer, and I have logmein open, used especially on my second screen. I have fiber optic internet, and regular computer use is not an issue. I've started to turn off my video, but that doesn't seem to necessarily be the reason for connection issues. I very often need to share my screen - this seems to be part of the issue. Sometimes simple tasks of typing in an email during a meeting on logmein creates issues.
@Bahar-b I would first visit the PC's manufacturer web page to confirm that all your drivers are up to date.
Next, I would run the GoTo Connection Wizard when you have a moment before your next meeting: https://support.goto.com/meeting/help/install-and-run-the-connection-wizard-windows
This may help tailor your connection flow to provide better ease of access.