Few things are more annoying than a sluggish computer. The good news is that most performance issues come down to easy fixes.
Start by checking your startup programs — open Task Manager (Windows) or System Preferences → Users & Groups (Mac) and disable apps that launch automatically.
Next, clear temporary files using Disk Cleanup or CleanMyMac.
If you still feel lag, run a malware scan and ensure your system updates are installed.
Finally, consider upgrading to an SSD; it’s the single biggest speed boost you can get.

If you need us to look in to the issues and fix it for you remotely do let us know, we can do it for you.