Can you tell me exactly which Surface Pro you have?
The model makes a big difference because some Surface Pro models have a 120 Hz display while others are 60 Hz only.
Overheating is a more serious issue:
The Surface Pro relies primarily on passive cooling through its body, so avoid placing it on soft surfaces like blankets or pillows that block airflow. A hard flat surface, or better yet a small stand that tilts it up, makes a real difference.
Press Ctrl + Shift + Esc to open Task Manager, click the CPU column to sort by usage, and see what's at the top.
Make sure you're on Balanced Power Plan.