GNOME shell high idle CPU usage from visual extension

gnome-shell process consistently consumes 20% CPU even when idle after installing visual extensions like 'Blur my shell'. This indicates excessive resource consumption from poorly optimized extension code running with shell privileges.

Use ram-compare tool to identify which processes have changed memory/CPU consumption patterns. Disable the problematic extension through GNOME extension manager. Monitor system behavior with htop or gnome-system-monitor to verify CPU usage returns to normal levels.