However, some times, after updating, your laptop or PC might slow down. Intentionally Windows updates will never make your PC slow. So, “why is your computer running slow after the update” you will find the explanation to that question in the following section. To be honest it is more frustrating to have a slow PC than a no PC. Sometimes, instead of boosting the performance, the Windows update might make your PC sluggish. However, when it comes to real-time performance, everything is not as expected. Windows updates are necessary, you get to experience the latest interface, better performance, and updated security.