There are so many reasons for laptop running slow. You may troubleshoot it as follows.
1. Check the system updates to see if it can be upgraded.
2. If too many programs are opening simultaneously, your laptop will speed down.
3. Check if the laptop is overheating.
4. Virus and malware may be the cause for it. Run anti-virus scan to remove them.
5. Update the outdated drivers.
6. Check hardware issues. Defrag hard drive to optimize it.
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