How does updating drivers improve performance?

Related questions

1. Can I update Windows XP to Windows 10 for free?
2. What is driver booster?
3. Do I have to pay for driver updates?
4. Will out of date drivers affect performance?
5. Are driver updates necessary?
6. Is there a free driver updater?
7. Do I need to update my drivers?
8. Should you update drivers?
9. Is there a free driver update?
10. What drivers should I install?

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20. #increase
21. #often