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If you're playing on a laptop, you'll get the best performance if you are plugged in. This is because your system will automatically throttle itself if it is running off battery to help make the battery last longer. This is great for word processing, but terrible for gaming. Your power-saving settings may be holding your hardware back, even if you're plugged in. You can change these settings from the Control Panel. You can open the Control Panel from the Start menu. In Windows 10, right-click the Start button and select "Power Options" to skip the whole Control Panel. If you are in Category view, click "Hardware and Sound," then "Power Options." This will reveal the "High performance" option. This will prevent your laptop from throttling your hardware while playing the game, which may increase your performance. Make sure to keep the laptop plugged in, as you'll lose battery quickly.
Plug your laptop into a power source. Open the Control Panel. Select "Power Options." Click the "Show additional plans" option. Select "High performance" and close the window.